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Cisco IOS Software Releases 12.0 S

Multicast-VPN—IP Multicast Support for MPLS VPNs

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Multicast-VPN—IP Multicast Support for MPLS VPNs

Table Of Contents

Multicast-VPN—IP Multicast Support for MPLS VPNs

Feature Overview

Multicast-VPN Routing and Forwarding and Multicast Domains

Multicast Distribution Trees

Multicast Tunnel Interface

Multicast Distributed Switching Support

Benefits

Restrictions

Related Documents

Supported Platforms

Supported Standards, MIBs, and RFCs

Prerequisites

Configuration Tasks

Enabling a VPN for Multicast Routing

Enabling PIM on Interfaces

Configuring a Default MDT Group for a VPN VRF

Configuring the Multicast Group Address Range for Data MDT Groups

Configuring the IP Source Address of Register Messages

Storing IP Multicast Packet Headers

Configuring an MSDP Peer

Limiting the Number of Multicast Routes

Verifying the MSDP Peer

Verifying Information for the MDT Default Group

Verifying Information for the MDT Data Group

Monitoring and Maintaining Multicast-VPN

Configuration Examples

Enabling a VPN for Multicast Routing Example

Configuring the Multicast Group Address Range for Data MDT Groups Example

Configuring the IP Source Address of Register Messages Example

Storing IP Multicast Packet Headers Example

Configuring an MSDP Peer Example

Limiting the Number of Multicast Routes Example

Command Reference

clear ip igmp group

clear ip mroute

clear ip msdp peer

clear ip msdp sa-cache

clear ip msdp statistics

clear ip pim auto-rp

debug ip igmp

debug ip mcache

debug ip mpacket

debug ip mrouting

debug ip msdp

debug ip msdp resets

debug ip pim

debug ip pim auto-rp

ip mroute

ip mroute-cache

ip msdp border

ip msdp cache-sa-state

ip msdp default-peer

ip msdp description

ip msdp filter-sa-request

ip msdp mesh-group

ip msdp originator-id

ip msdp peer

ip msdp redistribute

ip msdp sa-filter in

ip msdp sa-filter out

ip msdp sa-request

ip msdp shutdown

ip msdp ttl-threshold

ip multicast cache-headers

ip multicast mrinfo-filter

ip multicast multipath

ip multicast route-limit

ip multicast-routing

ip pim accept-register

ip pim accept-rp

ip pim bidir-enable

ip pim bsr-candidate

ip pim register-rate-limit

ip pim register-source

ip pim rp-announce-filter

ip pim rp-candidate

ip pim send-rp-announce

ip pim send-rp-discovery

ip pim spt-threshold

ip pim ssm

ip pim state-refresh disable

mdt data

mdt default

mdt log-reuse

show ip igmp groups

show ip igmp interface

show ip mcache

show ip mds interface

show ip mpacket

show ip mroute

show ip msdp count

show ip msdp peer

show ip msdp sa-cache

show ip msdp summary

show ip pim bsr

show ip pim interface

show ip pim mdt bgp

show ip pim mdt history

show ip pim mdt receive

show ip pim mdt send

show ip pim neighbor

show ip pim rp

show ip pim rp-hash (BSR)

show ip rpf


Multicast-VPN—IP Multicast Support for MPLS VPNs


Feature History

Release
Modification

12.0(23)S

This feature was introduced.

Supported Platforms

For platforms supported in Cisco IOS Release 12.0(23)S, consult Cisco Feature Navigator.


This document describes Multicast-VPN—IP Multicast Support for MPLS VPNs in Cisco IOS Release 12.0(23)S and includes the following sections:

Feature Overview

Supported Platforms

Supported Standards, MIBs, and RFCs

Prerequisites

Configuration Tasks

Configuration Examples

Command Reference

Feature Overview

This Multicast-VPN—IP Multicast Support for MPLS VPNs feature allows a service provider to configure and support multicast traffic in a Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) environment. Because MPLS VPNs support only unicast traffic connectivity, deploying the Multicast-VPN feature in conjunction with MPLS VPN allows service providers to offer both unicast and multicast connectivity to MPLS VPN customers.

This feature supports routing and forwarding of multicast packets for each individual VPN routing and forwarding (VRF) instance, and it also provides a mechanism to transport VPN multicast packets across the service provider backbone.

The Multicast-VPN feature in Cisco IOS software provides the ability to support the multicast feature over a Layer 3 VPN. As enterprises extend the reach of their multicast applications, service providers can accommodate these enterprises over their MPLS core network. IP multicast is used to stream video, voice, and data to a MPLS VPN network core.

A VPN is network connectivity across a shared infrastructure, such as an internet service provider (ISP). Its function is to provide the same policies and performance as a private network, at a reduced cost of ownership, thus creating many opportunities for cost savings through operations and infrastructure.

Historically, IP in IP generic route encapsulation (GRE) tunnels was the only way to connect through a service provider network. Although such tunneled networks tend to have scalability issues, they represent the only means of passing IP multicast traffic through a VPN.

MPLS was derived from tag switching and various other vendor methods of IP-switching support enhancements in the scalability and performance of IP-routed networks by combining the intelligence of routing with the high performance of switching. MPLS is now used for VPNs, which is an appropriate combination because MPLS decouples information used for forwarding of the IP packet (the label) from the information carried in the IP header.

A Multicast-VPN allows an enterprise to transparently interconnect its private network across the network backbone of a service provider. The use of a Multicast-VPN to interconnect an enterprise network in this way does not change the way that enterprise network is administered, nor does it change general enterprise connectivity.

Multicast-VPN Routing and Forwarding and Multicast Domains

Multicast-VPN introduces multicast routing information to the VPN routing and forwarding table. When a provider-edge (PE) router receives multicast data or control packets from a customer-edge (CE) router, forwarding is performed according to the information in the Multicast VRF (MVRF).

A set of Multicast-VPN Routing and Forwarding that can send multicast traffic to each other constitutes a multicast domain. For example, the multicast domain for a customer that wanted to send certain types of multicast traffic to all global employees would consist of all CE routers associated with that enterprise.

Multicast Distribution Trees

Multicast-VPN establishes a static default multicast distribution tree (MDT) for each multicast domain. The default MDT defines the path used by PE routers to send multicast data and control messages to every other PE router in the multicast domain.

Multicast-VPN also supports the dynamic creation of MDTs for high-bandwidth transmission. Data MDTs are a feature unique to Cisco IOS software. Data MDTs are intended for high-bandwidth sources such as full-motion video inside the VPN to ensure optimal traffic forwarding in the MPLS VPN core. The threshold at which the data MDT is created can be configured on a per-router or a per-VRF basis. When the multicast transmission exceeds the defined threshold, the sending PE router creates the data MDT and sends a User Datagram Protocol (UDP) messages, which contains information about the data MDT to all routers in the default MDT. The statistics to determine whether a multicast stream has exceeded the data MDT threshold are examined once every 10 seconds. If multicast distributed switching is configured, the time period can be up to twice as long.

Data MDTs are created only for (S, G) multicast route entries within the VRF multicast routing table. They are not created for (*, G) entries regardless of the value of the individual source data rate.

In the following example, a service provider has a multicast customer with offices in San Jose, New York, and Dallas. A one-way multicast presentation is occurring in San Jose. The service provider network supports all three sites associated with this customer, in addition to the Houston site of a different enterprise customer.

The default MDT for the enterprise customer consists of provider routers P1, P2, and P3 and their associated PE routers. PE4 is not part of the default MDT, because it is associated with a different customer. Figure 1 shows that no data flows along the default MDT, because no one outside of San Jose has joined the multicast.

Figure 1 Default Multicast Distribution Tree Overview

An employee in New York joins the multicast session. The PE router associated with the New York site sends a join request that flows across the default MDT for the multicast domain of the customer. PE1, the PE router associated with the multicast session source, receives the request. Figure 2 depicts that the PE router forwards the request to the CE router associated with the multicast source (CE1a).

Figure 2 Initializing the Data MDT

The CE router (CE1a) begins to send the multicast data to the associated PE router (PE1), which sends the multicast data along the default MDT. Immediately sending the multicast data, PE1 recognizes that the multicast data exceeds the bandwidth threshold as which a data MDT should be created. Therefore, PE1 creates a data MDT, sends a message to all routers using the default MDT that contains information about the data MDT, and, three seconds later, begins sending the multicast data for that particular stream using the data MDT. Only PE2 has interested receivers for this source, so only PE2 will join the data MDT and receive traffic on it.

PE routers maintain a PIM relationship with other PE routers over the default MDT as well as a PIM relationship with its directly attached PE routers.

Multicast Tunnel Interface

For every multicast domain of which an MVRF is a part, the PE router creates a multicast tunnel interface. A multicast tunnel interface is an interface the MVRF uses to access the multicast domain. It can be thought of as a conduit that connects an MVRF and the global MVRF. One tunnel interface is created per multicast VRF.

Multicast Distributed Switching Support

Multicast distributed switching (MDS) is supported for Multicast-VPN on the Cisco 7500 series routers. When MDS is configured, ensure that all interfaces enabled for IP multicast have MDS enabled correctly—verify that no interface has the no ip mroute-cache command configured (including loopback interfaces).

Use the following commands to enable MDS for a particular VRF:

ip multicast-routing distributed

ip multicast-routing vrf vrf-name distributed

The following example shows how to configure MDS on Ethernet interface 1/1/1:

interface ethernet 1/1/1
  ip mroute-cache distributed

Benefits

Provides a scalable solution to dynamically send information to multiple locations.

Provides high-speed information delivery.

Provides connectivity through a shared infrastructure.

Restrictions

If the core multicast routing is using Source Specific Multicast (SSM), then the data and default MDT groups must be configured within the SSM range of IP addresses by default.

The update source interface for the Border Gateway Protocol (BGP) peerings must be the same for all BGP peerings configured on the router in order for the default MDT to be configured properly. If you use a loopback address for BGP peering, then PIM sparse mode must be enabled on the loopback address.

The ip mroute-cache command must be enabled on the loopback interface used as the BGP peering interface in order for distributed multicast switching to function on the platforms that support it. The no ip mroute-cache command must not be present on these interfaces.

MPLS Multicast does not support multiple BGP peering update sources.

Data MDTs are not created for VRF PIM dense mode multicast streams because of the flood and prune nature of dense mode multicast flows and the resulting periodic bring-up and tear-down of such data MDTs.

Multiple BGP update sources are not supported and configuring them can break Multicast-VPN RPF checking. The source IP address of the Multicast-VPN tunnels is determined by the highest IP address used for the BGP peering update source. If this IP address is not the IP address used as the BGP peering address with the remote PE router, Multicast-VPN will not function properly.

Related Documents

For information on configuring IP multicast using Cisco IOS software, refer to the following documents:

Cisco IOS Release 12.0 Network Protocols Configuration Guide, Part 1

Cisco IOS Release 12.0 Network Protocols Command Reference, Part 1

Multicast VPN for MPLS Cisco white paper

Supported Platforms

Determining Platform Support Through Cisco Feature Navigator

Cisco IOS software is packaged in feature sets that are supported on specific platforms. To obtain updated information about platform support for this feature, access Cisco Feature Navigator. Cisco Feature Navigator dynamically updates the list of supported platforms as new platform support is added for the feature.

Cisco Feature Navigator is a web-based tool that enables you to determine which Cisco IOS software images support a specific set of features and which features are supported in a specific Cisco IOS image. You can search by feature or release. In the release section, you can compare releases side by side to display both the features unique to each software release and the features that releases have in common.

To access Cisco Feature Navigator, you must have an account on Cisco.com. If you have forgotten or lost your account information, send a blank e-mail to cco-locksmith@cisco.com. An automatic check will verify that your e-mail address is registered with Cisco.com. If the check is successful, account details with a new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com by following the directions at http://www.cisco.com/register.

Cisco Feature Navigator is updated regularly when major Cisco IOS software releases and technology releases occur. For the most current information, go to the Cisco Feature Navigator home page at the following URL:

http://www.cisco.com/go/fn

Availability of Cisco IOS Software Images

Platform support for particular Cisco IOS software releases is dependent on the availability of the software images for those platforms. Software images for some platforms may be deferred, delayed, or changed without prior notice. For updated information about platform support and availability of software images for each Cisco IOS software release, refer to the online release notes or, if supported, Cisco Feature Navigator.

Supported Standards, MIBs, and RFCs

Standards

No new standards are supported by these commands.

MIBs

No new MIBs are supported by these commands.

To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules, go to the Cisco MIB website on Cisco.com at the following URL:

http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml

RFCs

No new RFCs are supported by these commands.

Prerequisites

Service providers must have a multicast-enabled core in order to use the Cisco Multicast-VPN feature.

Configuration Tasks

See the following sections for configuration tasks for this feature. Each task in the list is identified as either required or optional.

Enabling a VPN for Multicast Routing (required)

Enabling PIM on Interfaces (required)

Configuring a Default MDT Group for a VPN VRF (required)

Configuring the Multicast Group Address Range for Data MDT Groups (optional)

Configuring the IP Source Address of Register Messages (optional)

Configuring the IP Source Address of Register Messages (required)

Storing IP Multicast Packet Headers (required)

Configuring an MSDP Peer (optional)

Limiting the Number of Multicast Routes (optional)

Verifying the MSDP Peer (optional)

Enabling a VPN for Multicast Routing

To enable IP multicast routing, use the following command in global configuration mode:

 
Command
Purpose

Step 1 

Router(config)# ip multicast-routing vrf vrf-name

Enables IP multicast routing.

Enabling PIM on Interfaces

Configure Protocol Independent Multicast (PIM) on all interfaces used for IP multicast. We recommend configuring PIM sparse mode on all physical interfaces of Provider Edge (PE) routers connecting to the backbone. We also recommend configuring PIM sparse mode on all loopback interfaces if they are used for BGP peering or if their IP address is used as an RP address for PIM.

To configure PIM on an interface to be in sparse mode, use the following command in interface configuration mode:

 
Command
Purpose

Step 1 

Router(config-if)# ip pim sparse-mode

Enables PIM sparse mode on the interface.

Configuring a Default MDT Group for a VPN VRF

To configure a default MDT group for a VRF, use the following commands beginning in global configuration mode:

 
Command
Purpose

Step 1 

Router(config)# ip vrf vrf-name

Enters VRF configuration mode and defines the VPN routing instance by assigning a VRF name.

Step 2 

Router(config-vrf)# mdt default group-address

Configures a default MDT group for a VRF.

Configuring the Multicast Group Address Range for Data MDT Groups

To configure the multicast group address range for data MDT groups, use the following commands beginning in global configuration mode:

 
Command
Purpose

Step 1 

Router(config)# ip vrf vrf-name

Enters VRF configuration mode and defines the VPN routing instance by assigning a VRF name.

Step 2 

Router(config-vrf)# mdt data group-address-range wildcard-bits [threshold threshold-value] [list access-list]

Configures the multicast group address range for data MDT groups.

Configuring the IP Source Address of Register Messages

Register messages are unicast messages sent by the designated router (DR) to the RP router when a multicast packet needs to be sent on a rendezvous point tree (RPT). By default, the IP source address (SA) of the register message is set to the address of the outgoing interface of the DR leading toward the RP. To configure the IP source address of a register message to an interface address other than the outgoing interface address of the DR leading toward the RP, use the following command in global configuration mode. The optional vrf vrf-name argument has been added to ip pim register-source commands to define the VPN routing instance by assigning a VRF name.

Command
Purpose

Router(config)# ip pim [vrf vrf-name] register-source type interface-number

Configures the IP source address of a register message.

Storing IP Multicast Packet Headers

You can store IP multicast packet headers in a cache and then display them to determine any of the following information:

Who is sending IP multicast packets to what groups

Interpacket delay

Duplicate IP multicast packets (if any)

Multicast forwarding loops in your network (if any)

Scope of the group

UDP port numbers

Packet length

To allocate a circular buffer to store IP multicast packet headers that the router receives, use the following command in global configuration mode. The optional vrf vrf-name argument has been added to ip multicast commands to define the VPN routing instance by assigning a VRF name:

Command
Purpose

Router(config)# ip multicast [vrf vrf-name] cache-headers [rtp]

Allocates a circular buffer to store IP multicast packet headers that the router receives.

Configuring an MSDP Peer

To configure a Multicast Source Discovery Protocol (MSDP) peer, use the following command in global configuration mode. The optional vrf vrf-name argument has been added to ip msdp commands to define the VPN routing instance by assigning a VRF name:

Command
Purpose

Router(config)# ip msdp [vrf vrf-name] peer {peer-name | peer-address} [connect-source type number] [remote-as as-number]

Configures an MSDP peer.


Note If you use a loopback address for BGP peering, then PIM sparse mode must be enabled on the loopback address.


Limiting the Number of Multicast Routes

To limit the number of multicast routes that can be added in a router, use the following command in global configuration mode.

Command
Purpose
Router(config)# ip multicast route-limit 
limit threshold 

Sets the mroute limit and the threshold parameters.

Verifying the MSDP Peer

To display detailed information about and to verify information regarding the MSDP peer, perform the following steps.


Step 1 Enter the show ip msdp peer command to verify detailed information about MSDP peer 224.135.250.116:

Router# show ip msdp peer 224.135.250.116

MSDP Peer 224.135.250.116 (rtp5-rp1.cisco.com), AS 109 (configured AS)
Description:
 Connection status:
   State: Up, Resets: 9, Connection source: Loopback2 (228.69.199.17)
   Uptime(Downtime): 1d10h, Messages sent/received: 436765/429062
   Output messages discarded: 0
   Connection and counters cleared 1w2d     ago
 SA Filtering:
   Input (S,G) filter: none, route-map: none
   Input RP filter: none, route-map: none
   Output (S,G) filter: none, route-map: none
   Output RP filter: none, route-map: none
 SA-Requests:
   Input filter: none
   Sending SA-Requests to peer: disabled
 Peer ttl threshold: 0
 SAs learned from this peer: 32, SAs limit: 500
 Input queue size: 0, Output queue size: 0

Step 2 Enter the show ip msdp summary to display MSDP peer status:

Router# show ip msdp summary

MSDP Peer Status Summary
Peer Address     AS    State    Uptime/  Reset SA    Peer Name
                                Downtime Count Count
224.135.250.116  109   Up       1d10h    9     111   rtp5-rp1
*144.228.240.253 1239  Up       14:24:00 5     4010  sl-rp-stk
172.16.253.19    109   Up       12:36:17 5     10    rtp4-rp1
172.16.170.110   109   Up       1d11h    9     12    ams-rp1

Verifying Information for the MDT Default Group

To display information about and to verify information about the BGP advertisement of the route distinguisher (RD) for the MDT default group, use the show ip pim mdt bgp command in EXEC mode.

Router# show ip pim mdt bgp

MDT-default group 232.2.1.4
 rid:1.1.1.1 next_hop:1.1.1.1

Verifying Information for the MDT Data Group

To display detailed information about and to verify information regarding the MDT data group, perform the following steps.


Step 1 Enter the show ip pim mdt receive command to show the data MDT advertisements received by a specified router:

Router# show ip pim vrf vpn8 mdt receive detail

Joined MDT-data groups for VRF:vpn8
group:232.2.8.0 source:10.0.0.100 ref_count:13
(10.101.8.10, 225.1.8.1), 1d13h/00:03:28/00:02:26, OIF count:1, flags:TY
(10.102.8.10, 225.1.8.1), 1d13h/00:03:28/00:02:27, OIF count:1, flags:TY

Step 2 Enter the show ip pim mdt send command to show the MDT advertisements that a specified router has made:

Router# show ip pim mdt send

MDT-data send list for VRF:vpn8
  (source, group)                     MDT-data group      ref_count
  (10.100.8.10, 225.1.8.1)            232.2.8.0           1
  (10.100.8.10, 225.1.8.2)            232.2.8.1           1
  (10.100.8.10, 225.1.8.3)            232.2.8.2           1
  (10.100.8.10, 225.1.8.4)            232.2.8.3           1
  (10.100.8.10, 225.1.8.5)            232.2.8.4           1
  (10.100.8.10, 225.1.8.6)            232.2.8.5           1
  (10.100.8.10, 225.1.8.7)            232.2.8.6           1
  (10.100.8.10, 225.1.8.8)            232.2.8.7           1
  (10.100.8.10, 225.1.8.9)            232.2.8.8           1
  (10.100.8.10, 225.1.8.10)           232.2.8.9           1


Monitoring and Maintaining Multicast-VPN

To monitor and maintain the Multicast-VPN feature, use the following EXEC commands:

Command
Purpose

Router# clear ip igmp group

Deletes entries from the Internet Group Management Protocol (IGMP) cache.

Router# clear ip mroute

Deletes entries from the IP multicast routing table.

Router# clear ip msdp peer

Clears the TCP connection to the specified MSDP peer.

Router# clear ip msdp sa-cache

Clears MSDP Source-Active (SA) cache entries.

Router# clear ip msdp statistics

Clears statistics counters for one or all of the MSDP peers without resetting the sessions.

Router# clear ip pim auto-rp

Deletes entries from the Auto-RP cache.

Router# show ip igmp groups

Displays the multicast groups with receivers that are directly connected to the router and that were learned through IGMP.

Router# show ip igmp interface

Displays multicast-related information about an interface.

Router# show ip mcache

Displays the contents of the IP multicast fast-switching cache.

Router# show ip mds interface

Displays MDS information for all the interfaces on the line card.

Router# show ip mpacket

Displays the contents of the circular cache-header buffer.

Router# show ip mroute

Displays the contents of the IP multicast routing table.

Router# show ip msdp count

Displays the number of sources and groups originated in MSDP SA messages.

Router# show ip msdp peer

Displays detailed information about the MSDP peer.

Router# show ip msdp sa-cache

Displays the state learned from MSDP peers.

Router# show ip msdp summary

Displays MSDP peer status.

Router# show ip pim bsr

Displays the bootstrap router (BSR) information.

Router# show ip pim interface

Displays information about interfaces configured for PIM.

Router# show ip pim mdt bgp

Displays information about the BGP advertisement of the route distinguisher (RD) for the MDT default group

Router# show ip pim mdt receive

Displays the data MDT advertisements received by a specified router.

Router# show ip pim mdt send

Displays the MDT advertisements made by a specified router.

Router# show ip pim neighbor

Lists the PIM neighbors discovered by the Cisco IOS software.

Router# show ip pim rp

Displays active RPs that are cached with associated multicast routing entries.

Router# show ip pim rp-hash

Displays which RP is being selected for a specified group.

Router# show ip rpf

Displays how IP multicast routing does RPF.


Configuration Examples

This section provides the following configuration examples:

Enabling a VPN for Multicast Routing Example

Configuring the Multicast Group Address Range for Data MDT Groups Example

Configuring the IP Source Address of Register Messages Example

Storing IP Multicast Packet Headers Example

Configuring an MSDP Peer Example

Limiting the Number of Multicast Routes Example

Enabling a VPN for Multicast Routing Example

In the following example, Multicast routing is enabled with a VPN routing instance named of vrf1:

ip multicast-routing vrf1

Configuring the Multicast Group Address Range for Data MDT Groups Example

In the following example, the VPN routing instance is assigned a VRF name of blue. The MDT default group for a VPN VRF is 239.1.1.1, and the multicast group address range for MDT groups is 239.1.2.0 with wildcard bits of 0.0.0.3:

Router(config)# ip vrf blue

Router(config-vrf)# rd 55:1111

Router(config-vrf)# route-target both 55:1111

Router(config-vrf)# mdt default 239.1.1.1

Router(config-vrf)# mdt data 239.1.2.0 0.0.0.3

Router(config-vrf)# end


Router> show ip vrf blue
  Name                             Default RD          Interfaces
  blue                             55:1111

Configuring the IP Source Address of Register Messages Example

In the following example, the IP source address of the register message is configured to the E1 interface of a DR:

Router(config)# ip pim register-source E1/0/1

Router> show running-config | incl register

ip pim register-source Ethernet1/0/1

Storing IP Multicast Packet Headers Example

In the following example, a circular buffer is allocated to store IP multicast packet headers that the router receives. The VPN routing instances in this example are named vrf1 and vrf2:

Router(config)# ip multicast vrf vrf1 cache-headers

Router(config)# ip multicast vrf vrf2 cache-headers

Router> show running-config

Building configuration...

Current configuration :3552 bytes
!
! Last configuration change at 16:52:30 UTC Fri May 31 2002
!
version 12.0
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
no service single-slot-reload-enable
!
hostname Router
!
.
.
.
ip vrf vrf1
 rd 55:111
 route-target export 55:111
 route-target import 55:111
 mdt default 232.1.1.1
!
ip vrf vrf2
 rd 55:112
 route-target export 55:112
 route-target import 55:112
 mdt default 232.2.2.2
!
ip multicast-routing distributed
ip multicast-routing vrf vrf1 distributed
ip multicast-routing vrf vrf2 distributed
ip multicast vrf vrf1 cache-headers
ip multicast vrf vrf2 cache-headers
ip cef distributed
.
.
.
interface Ethernet1/0/3.1
 encapsulation dot1Q 1 native
 ip vrf forwarding vrf1
 ip address 20.1.1.1 255.255.255.0
 no ip redirects
 no ip proxy-arp
 ip pim sparse-dense-mode
 no keepalive
 no cdp enable
!
interface Ethernet1/0/3.2
 encapsulation dot1Q 2
 ip vrf forwarding vrf2
 ip address 20.1.1.2 255.255.255.0
 no ip redirects
 no ip proxy-arp
 ip pim sparse-dense-mode
 no keepalive
 no cdp enable
.
.
.
address-family ipv4 vrf vrf2
 redistribute connected
 redistribute static
 redistribute rip metric 50
 no auto-summary
 no synchronization
 exit-address-family
 !
 address-family ipv4 vrf vrf1
 redistribute connected
 redistribute static
 redistribute rip metric 50
 no auto-summary
 no synchronization
 exit-address-family
.
.
.
end

Configuring an MSDP Peer Example

In the following example, an MSDP peer is configured with a VPN routing instance named of vrf1 and a source of 10.10.0.1 from E1 interface:

ip msdp vrf vrf1 peer 10.10.0.1 connect-source E1/0/1

Limiting the Number of Multicast Routes Example

In the following example, the number of multicast routes that can be added in to a multicast routing table is set to 200,000 and the threshold value of the number of mroutes that will cause a warning message to occur is set to 20,000:

Router# show running-config

ip multicast-routing distributed
ip multicast-routing vrf cisco distributed
ip multicast cache-headers
ip multicast route-limit 200000 20000
ip multicast vrf cisco route-limit 200000 20000
!
.
.
.

Command Reference

This section documents new and modified commands. All other commands used with this feature are documented in the Cisco IOS Release 12.0 command reference publications.

clear ip igmp group

clear ip mroute

clear ip msdp peer

clear ip msdp sa-cache

clear ip msdp statistics

clear ip pim auto-rp

debug ip igmp

debug ip mcache

debug ip mpacket

debug ip mrouting

debug ip msdp

debug ip msdp resets

debug ip pim

debug ip pim auto-rp

ip mroute

ip mroute-cache

ip msdp border

ip msdp cache-sa-state

ip msdp default-peer

ip msdp description

ip msdp filter-sa-request

ip msdp mesh-group

ip msdp originator-id

ip msdp peer

ip msdp redistribute

ip msdp sa-filter in

ip msdp sa-filter out

ip msdp sa-request

ip msdp shutdown

ip msdp ttl-threshold

ip multicast cache-headers

ip multicast mrinfo-filter

ip multicast multipath

ip multicast route-limit

ip multicast-routing

ip pim accept-register

ip pim accept-rp

ip pim bidir-enable

ip pim bsr-candidate

ip pim register-rate-limit

ip pim register-source

ip pim rp-announce-filter

ip pim rp-candidate

ip pim send-rp-announce

ip pim send-rp-discovery

ip pim spt-threshold

ip pim ssm

ip pim state-refresh disable

mdt data

mdt default

mdt log-reuse

show ip igmp groups

show ip igmp interface

show ip mcache

show ip mds interface

show ip mpacket

show ip mroute

show ip msdp count

show ip msdp peer

show ip msdp sa-cache

show ip msdp summary

show ip pim bsr

show ip pim interface

show ip pim mdt bgp

show ip pim mdt history

show ip pim mdt receive

show ip pim mdt send

show ip pim neighbor

show ip pim rp

show ip pim rp-hash (BSR)

show ip rpf

clear ip igmp group

To delete entries from the Internet Group Management Protocol (IGMP) cache, use the clear ip igmp group command in EXEC mode.

clear ip igmp [vrf vrf-name] group [group-name | group-address | interface-type interface-number]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

group-name

(Optional) Name of the multicast group, as defined in the Domain Name System (DNS) hosts table or with the ip host command.

group-address

(Optional) Address of the multicast group. This is a multicast IP address in four-part, dotted notation.

interface-type interface-number

(Optional) Interface type and number.


Defaults

When this command is used with no arguments, all entries are deleted from the IGMP cache.

Command Modes

EXEC

Command History

Release
Modification

10.0

This command was introduced.

12.2(11)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

The IGMP cache contains a list of the multicast groups of which hosts on the directly connected LAN are members. If the router has joined a group, that group is also listed in the cache.

To delete all entries from the IGMP cache, specify the clear ip igmp group command with no arguments.

Examples

The following example clears entries for the multicast group 224.0.255.1 from the IGMP cache:

Router> clear ip igmp group 224.0.255.1

Related Commands

Command
Description

ip host

Defines a static host name-to-address mapping in the host cache.

show ip igmp groups

Displays the multicast groups that are directly connected to the router and that were learned through IGMP.

show ip igmp interface

Displays multicast-related information about an interface.


clear ip mroute

To delete entries from the IP multicast routing table, use the clear ip mroute command in EXEC mode.

clear ip mroute [vrf vrf-name] {* | group } [source]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

*

Deletes all entries from the IP multicast routing table.

group

Either of the following:

Name of the multicast group, as defined in the Domain Name System (DNS) hosts table or with the ip host command.

IP address of the multicast group. This is a multicast IP address in four-part, dotted notation.

source

(Optional) If you specify a group name or address, you can also specify a name or address of a multicast source that is sending to the group. A source need not be a member of the group.


Command Modes

EXEC

Command History

Release
Modification

10.0

This command was introduced.

12.0(5)T

The effect of this command was modified. If IP multicast Multilayer Switching (MLS) is enabled, using this command now clears both the multicast routing table on the Multicast Multilayer Switching (MMLS) RP and all multicast MLS cache entries for all MMLS-SEs that are performing multicast MLS for the MMLS-RP. That is, the original clearing occurs, and the derived hardware switching table is also cleared.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Examples

The following example deletes all entries from the IP multicast routing table:

Router> clear ip mroute *

The following example deletes from the IP multicast routing table all sources on the 228.3.0.0 subnet that are sending to the multicast group 224.2.205.42. Note that this example deletes all sources on network 228.3, not individual sources.

Router> clear ip mroute 224.2.205.42 228.3.0.0

Related Commands

Command
Description

ip host

Defines a static host name-to-address mapping in the host cache.

mls rp ip multicast

Enables IP multicast MLS (hardware switching) on an external or internal router in conjunction with Layer 3 switching hardware for the Catalyst 5000 switch.

show ip mroute

Displays the contents of the IP multicast routing table.


clear ip msdp peer

To clear the TCP connection to the specified Multicast Source Discovery Protocol (MSDP) peer, use the clear ip msdp peer command in EXEC mode.

clear ip msdp [vrf vrf-name] peer {peer-address | peer-name}

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

peer-address | peer-name

IP address or name of the MSDP peer to which the TCP connection is cleared.


Command Modes

EXEC

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

This command closes the TCP connection to the peer, resets all the MSDP peer statistics, and clears the input and output queues to and from the MSDP peer.

Examples

The following example clears the TCP connection to the MSDP peer at 224.15.9.8:

Router> clear ip msdp peer 224.15.9.8

Related Commands

Command
Description

ip msdp peer

Configures an MSDP peer.


clear ip msdp sa-cache

To clear Multicast Source Discovery Protocol (MSDP) Source-Active (SA) cache entries, use the clear ip msdp sa-cache command in EXEC mode.

clear ip msdp [vrf vrf-name] sa-cache [group-address | group-name]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

group-address | group-name

(Optional) Multicast group address or name for which SA entries are cleared from the SA cache.


Command Modes

EXEC

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

In order to have any SA entries in the cache to clear, SA caching must have been enabled with the ip msdp cache-sa-state command.

If no multicast group is identified by group address or name, all SA cache entries are cleared.

Examples

The following example clears the SA entries for the multicast group 224.5.6.7 from the cache:

Router> clear ip msdp sa-cache 224.5.6.7

Related Commands

Command
Description

ip msdp cache-sa-state

Enables the router to create SA state.

show ip msdp sa-cache

Displays (S, G) state learned from MSDP peers.


clear ip msdp statistics

To clear statistics counters for one or all of the Multicast Source Discovery Protocol (MSDP) peers without resetting the sessions, use the clear ip msdp statistics command in EXEC mode.

clear ip msdp [vrf vrf-name] statistics [peer-address | peer-name]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

peer-address | peer-name

(Optional) Address or name of the MSDP peers whose statistics counters, reset count, and input/output count are cleared.


Command Modes

EXEC

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Examples

The following example clears the counters for the peer named sanjose:

Router> clear ip msdp statistics sanjose

clear ip pim auto-rp

To delete entries from the Auto-RP cache, use the clear ip pim auto-rp command in EXEC mode.

clear ip pim [vrf vrf-name] auto-rp rp-address

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

rp-address

Clears only the entries related to the rendezvous point (RP) at this address. If this argument is omitted, the entire Auto-RP cache is cleared.


Command Modes

EXEC

Command History

Release
Modification

11.3

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Examples

The following example deletes all entries from the Auto-RP cache:

Router> clear ip pim auto-rp 224.5.6.7

debug ip igmp

To display Internet Group Management Protocol (IGMP) packets received and sent, and IGMP-host related events, use the debug ip igmp command in privileged EXEC mode. To disable debugging output, use the no form of this command.

debug ip igmp [vrf vrf-name]

no debug ip igmp [vrf vrf-name]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.


Defaults

No default behavior or values.

Command Modes

Privileged EXEC

Command History

Release
Modification

10.2

This command was introduced.

12.1(3)T

Additional fields were added to the output of this command to support the Source Specific Multicast (SSM) feature.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

This command helps discover whether the IGMP processes are functioning. In general, if IGMP is not working, the router process never discovers that another host is on the network that is configured to receive multicast packets. In dense mode, this situation will result in packets being delivered intermittently (a few every 3 minutes). In sparse mode, packets will never be delivered.

Use this command in conjunction with the debug ip pim and debug ip mrouting commands to observe additional multicast activity and to learn the status of the multicast routing process, or why packets are forwarded out of particular interfaces.

Examples

The following is sample output from the debug ip igmp command:

Router# debug ip igmp

IGMP: Received Host-Query from 172.16.37.33 (Ethernet1) 
IGMP: Received Host-Report from 172.16.37.192 (Ethernet1) for 224.0.255.1 
IGMP: Received Host-Report from 172.16.37.57 (Ethernet1) for 224.2.127.255 
IGMP: Received Host-Report from 172.16.37.33 (Ethernet1) for 225.2.2.2 

The messages displayed by the debug ip igmp command show query and report activity received from other routers and multicast group addresses.

The following is sample output from the debug ip igmp command when SSM is enabled. Because IGMP Version 3 lite (IGMP v3lite) requires the host to send IGMP Version 2 (IGMPv2) packets, IGMPv2 host reports also will be displayed in response to the router IGMPv2 queries. If SSM is disabled, the word "ignored" will be displayed in the debug ip igmp command output.

IGMP:Received v3-lite Report from 10.0.119.142 (Ethernet3/3), group count 1
IGMP:Received v3 Group Record from 10.0.119.142 (Ethernet3/3) for 232.10.10.10
IGMP:Update source 224.1.1.1
IGMP:Send v2 Query on Ethernet3/3 to 224.0.0.1
IGMP:Received v2 Report from 10.0.119.142 (Ethernet3/3) for 232.10.10.10
IGMP:Update source 224.1.1.1

Related Commands

Command
Description

debug ip mrm

Displays MRM control packet activity.

debug ip pim

Displays PIM packets received and sent, and PIM-related events.


debug ip mcache

To display IP multicast fast-switching events, use the debug ip mcache command in privileged EXEC mode. To disable debugging output, use the no form of this command.

debug ip mcache [vrf vrf-name] [hostname | group-address]

no debug ip mcache [vrf vrf-name] [hostname | group-address]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

hostname

(Optional) The host name.

group-address

(Optional) The group address.


Defaults

No default behavior or values.

Command Modes

Privileged EXEC

Command History

Release
Modification

11.0

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

Use this command when multicast fast switching appears not to be functioning.

Examples

The following is sample output from the debug ip mcache command when an IP multicast route is cleared:

Router# debug ip mcache

IP multicast fast-switching debugging is on
 
Router# clear ip mroute *

MRC: Build MAC header for (172.31.60.185/32, 224.2.231.173), Ethernet0
MRC: Fast-switch flag for (172.31.60.185/32, 224.2.231.173), off -> on, caller 
ip_mroute_replicate-1
MRC: Build MAC header for (172.31.191.10/32, 224.2.127.255), Ethernet0
MRC: Build MAC header for (172.31.60.152/32, 224.2.231.173), Ethernet0

Table 1 describes the significant fields shown in the display.

Table 1 debug ip mcache Field Descriptions 

Field
Description

MRC

Multicast route cache.

Fast-switch flag

Route is fast switched.

(172.31.60.185/32)

Host route with 32 bits of mask.

off -> on

State has changed.

caller ...

The code function that activated the state change.


Related Commands

Command
Description

debug ip dvmrp

Displays information on DVMRP packets received and sent.

debug ip igmp

Displays IGMP packets received and sent, and IGMP-host related events.

debug ip igrp transactions

Displays transaction information on IGRP routing transactions.

debug ip mrm

Displays MRM control packet activity.

debug ip sd

Displays all SD announcements received.



debug ip mpacket

To display IP multicast packets received and sent, use the debug ip mpacket command in privileged EXEC mode. To disable the debugging output, use the no form of this command.

debug ip mpacket [vrf vrf-name] [detail | fastswitch] [access-list] [group]

no debug ip mpacket [vrf vrf-name] [detail | fastswitch] [access-list] [group]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

detail

(Optional) Causes the debug ip mpacket command to display IP header information and MAC address information.

fastswitch

(Optional) Displays IP packet information in the fast path.

access-list

(Optional) The access list number.

group

(Optional) The group name or address.


Defaults

The debug ip mpacket command displays all IP multicast packets switched at the process level.

Command Modes

Privileged EXEC

Command History

Release
Modification

10.2

This command was introduced.

12.1(2)T

The fastswitch keyword was added.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

This command displays information for multicast IP packets that are forwarded from this router. Use the access-list or group argument to limit the display to multicast packets from sources described by the access list or a specific multicast group.

Use this command with the debug ip packet command to display additional packet information.


Note The debug ip mpacket command generates many messages. Use this command with care so that performance on the network is not affected by the debug message traffic.


Examples

The following is sample output from the debug ip mpacket command:

Router# debug ip mpacket 224.2.0.1 
 
IP: s=10.188.34.54 (Ethernet1), d=224.2.0.1 (Tunnel0), len 88, mforward 
IP: s=10.188.34.54 (Ethernet1), d=224.2.0.1 (Tunnel0), len 88, mforward 
IP: s=10.188.34.54 (Ethernet1), d=224.2.0.1 (Tunnel0), len 88, mforward 
IP: s=10.162.3.27 (Ethernet1), d=224.2.0.1 (Tunnel0), len 68, mforward 

Table 2 describes the significant fields shown in the display.

Table 2 debug ip mpacket Field Descriptions 

Field
Description

IP

IP packet.

s=10.188.34.54

Source address of the packet.

(Ethernet1)

Name of the interface that received the packet.

d=224.2.0.1

Multicast group address that is the destination for this packet.

(Tunnel0)

Outgoing interface for the packet.

len 88

Number of bytes in the packet. This value will vary depending on the application and the media.

mforward

Packet has been forwarded.


Related Commands

Command
Description

debug ip dvmrp

Displays information on DVMRP packets received and sent.

debug ip igmp

Displays IGMP packets received and sent, and IGMP host-related events.

debug ip mrm

Displays MRM control packet activity.

debug ip packet

Displays general IP debugging information and IPSO security transactions.

debug ip sd

Displays all SD announcements received.


debug ip mrouting

To display changes to the IP multicast routing table, use the debug ip mrouting command in privileged EXEC mode. To disable debugging output, use the no form of this command.

debug ip mrouting [vrf vrf-name] [group]

no debug ip mrouting [vrf vrf-name] [group]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

group

(Optional) Group name or address to monitor packet activity of a single group.


Defaults

No default behavior or values.

Command Modes

Privileged EXEC

Command History

Release
Modification

10.2

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

This command indicates when the router has made changes to the mroute table. Use the debug ip pim and debug ip mrouting commands consecutively to obtain additional multicast routing information. In addition, use the debug ip igmp command to learn why an mroute message is being displayed.

This command generates a substantial amount of output. Use the optional group argument to limit the output to a single multicast group.

Examples

The following is sample output from the debug ip mrouting command:

Router# debug ip mrouting 224.2.0.1 
 
MRT: Delete (10.0.0.0/8, 224.2.0.1) 
MRT: Delete (10.4.0.0/16, 224.2.0.1) 
MRT: Delete (10.6.0.0/16, 224.2.0.1) 
MRT: Delete (10.9.0.0/16, 224.2.0.1) 
MRT: Delete (10.16.0.0/16, 224.2.0.1) 
MRT: Create (*, 224.2.0.1), if_input NULL 
MRT: Create (224.69.15.0/24, 225.2.2.4), if_input Ethernet0, RPF nbr 224.69.61.15
MRT: Create (224.69.39.0/24, 225.2.2.4), if_input Ethernet1, RPF nbr 0.0.0.0
MRT: Create (10.0.0.0/8, 224.2.0.1), if_input Ethernet1, RPF nbr 224.0.0.0 
MRT: Create (10.4.0.0/16, 224.2.0.1), if_input Ethernet1, RPF nbr 224.0.0.0 
MRT: Create (10.6.0.0/16, 224.2.0.1), if_input Ethernet1, RPF nbr 224.0.0.0 
MRT: Create (10.9.0.0/16, 224.2.0.1), if_input Ethernet1, RPF nbr 224.0.0.0 
MRT: Create (10.16.0.0/16, 224.2.0.1), if_input Ethernet1, RPF nbr 224.0.0.0 

The following lines show that multicast IP routes were deleted from the routing table:

MRT: Delete (10.0.0.0/8, 224.2.0.1) 
MRT: Delete (10.4.0.0/16, 224.2.0.1) 
MRT: Delete (10.6.0.0/16, 224.2.0.1) 

The (*, G) entries are generally created by receipt of an IGMP host report from a group member on the directly connected LAN or by a Protocol Independent Multicast (PIM) join message (in sparse mode) that this router receives from a router that is sending joins toward the RP. This router will in turn send a join toward the route processor (RP) that creates the shared tree (or RP tree).

MRT: Create (*, 224.2.0.1), if_input NULL 

The following lines are an example of creating an (S, G) entry that shows that an mpacket was received on Ethernet interface 0. The second line shows a route being created for a source that is on a directly connected LAN. The RPF means "reverse path forwarding," whereby the router looks up the source address of the multicast packet in the unicast routing table and asks which interface will be used to send a packet to that source.

MRT: Create (224.69.15.0/24, 225.2.2.4), if_input Ethernet0, RPF nbr 224.69.61.15
MRT: Create (224.69.39.0/24, 225.2.2.4), if_input Ethernet1, RPF nbr 224.0.0.0
 

The following lines show that multicast IP routes were added to the routing table. Note the 224.0.0.0 as the RPF, which means the route was created by a source that is directly connected to this router.

MRT: Create (10.9.0.0/16, 224.2.0.1), if_input Ethernet1, RPF nbr 224.0.0.0 
MRT: Create (10.16.0.0/16, 224.2.0.1), if_input Ethernet1, RPF nbr 224.0.0.0 

If the source is not directly connected, the neighbor address shown in these lines will be the address of the router that forwarded the packet to this router.

The shortest path tree state maintained in routers consists of source (S), multicast address (G), outgoing interface (OIF), and incoming interface (IIF). The forwarding information is referred to as the multicast forwarding entry for (S, G).

An entry for a shared tree can match packets from any source for its associated group if the packets come through the proper incoming interface as determined by the Reverse Path Forwarding (RPF) lookup. Such an entry is denoted as (*, G). A (*, G) entry keeps the same information a (S, G) entry keeps, except that it saves the rendezvous point (RP) address in place of the source address in sparse mode or 24.0.0.0 in dense mode.

Related Commands

Command
Description

debug ip dvmrp

Displays information on DVMRP packets received and sent.

debug ip igmp

Displays IGMP packets received and sent, and IGMP host-related events.

debug ip packet

Displays general IP debugging information and IPSO security transactions.

debug ip pim

Displays all SD announcements received.

debug ip sd

Displays all SD announcements received.


debug ip msdp

To debug Multicast Source Discovery Protocol (MSDP) activity, use the debug ip msdp command in privileged EXEC mode. To disable debugging activity, use the no form of this command.

debug ip msdp [vrf vrf-name] [peer-address | name] [detail] [routes]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

peer-address | name

(Optional) The peer for which debug events are logged.

detail

(Optional) Provides more detailed debugging information.

routes

(Optional) Displays the contents of Source-Active messages.


Defaults

No default behavior or values.

Command Modes

Privileged EXEC

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Examples

The following is sample output from the debug ip msdp command:

Router# debug ip msdp

MSDP debugging is on
Router#
MSDP: 224.150.44.254: Received 1388-byte message from peer
MSDP: 224.150.44.254: SA TLV, len: 1388, ec: 115, RP: 172.31.3.92 
MSDP: 224.150.44.254: Peer RPF check passed for 172.31.3.92, used EMBGP peer
MSDP: 224.150.44.250: Forward 1388-byte SA to peer
MSDP: 224.150.44.254: Received 1028-byte message from peer
MSDP: 224.150.44.254: SA TLV, len: 1028, ec: 85, RP: 172.31.3.92 
MSDP: 224.150.44.254: Peer RPF check passed for 172.31.3.92, used EMBGP peer
MSDP: 224.150.44.250: Forward 1028-byte SA to peer
MSDP: 224.150.44.254: Received 1388-byte message from peer
MSDP: 224.150.44.254: SA TLV, len: 1388, ec: 115, RP: 172.31.3.111 
MSDP: 224.150.44.254: Peer RPF check passed for 172.31.3.111, used EMBGP peer
MSDP: 224.150.44.250: Forward 1388-byte SA to peer
MSDP: 224.150.44.250: Received 56-byte message from peer
MSDP: 224.150.44.250: SA TLV, len: 56, ec: 4, RP: 205.167.76.241 
MSDP: 224.150.44.250: Peer RPF check passed for 205.167.76.241, used EMBGP peer
MSDP: 224.150.44.254: Forward 56-byte SA to peer
MSDP: 224.150.44.254: Received 116-byte message from peer
MSDP: 224.150.44.254: SA TLV, len: 116, ec: 9, RP: 172.31.3.111 
MSDP: 224.150.44.254: Peer RPF check passed for 172.31.3.111, used EMBGP peer
MSDP: 224.150.44.250: Forward 116-byte SA to peer
MSDP: 224.150.44.254: Received 32-byte message from peer
MSDP: 224.150.44.254: SA TLV, len: 32, ec: 2, RP: 172.31.3.78 
MSDP: 224.150.44.254: Peer RPF check passed for 172.31.3.78, used EMBGP peer
MSDP: 224.150.44.250: Forward 32-byte SA to peer

Table 3 describes the significant fields shown in the display.

Table 3 debug ip msdp Field Descriptions

Field
Description

MSDP

Protocol being debugged.

224.150.44.254:

IP address of the MSDP peer.

Received 1388-byte message from peer

MSDP event.


debug ip msdp resets

To debug Multicast Source Discovery Protocol (MSDP) peer reset reasons, use the debug ip msdp resets command in privileged EXEC mode.

debug ip msdp [vrf vrf-name] resets

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.


Defaults

No default behavior or values.

Command Modes

Privileged EXEC

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


debug ip pim

To display Protocol Independent Multicast (PIM) packets received and sent, and to display PIM-related events, use the debug ip pim command in privileged EXEC mode. To disable debugging output, use the no form of this command.

debug ip pim [vrf vrf-name] [group | df [rp-address]]

no debug ip pim [vrf vrf-name] [group | df [rp-address]]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

group

(Optional) The group name or address to monitor the packet activity of a single group.

df

(Optional) When bidirectional PIM is used, displays all designated forwarder (DF) election messages.

rp-address

(Optional) The rendezvous point (RP) IP address.


Defaults

All PIM packets are displayed.

Command Modes

Privileged EXEC

Command History

Release
Modification

10.2

This command was introduced.

12.1(2)T

The df keyword was added.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

PIM uses Internet Group Management Protocol (IGMP) packets to communicate with routers and advertise reachability information.

Use this command with the debug ip igmp and debug ip mrouting commands to display additional multicast routing information.

Examples

The following is sample output from the debug ip pim command:

Router# debug ip pim 224.2.0.1 
 
PIM: Received Join/Prune on Ethernet1 from 172.16.37.33 
PIM: Received Join/Prune on Ethernet1 from 172.16.37.33 
PIM: Received Join/Prune on Tunnel0 from 10.3.84.1 
PIM: Received Join/Prune on Ethernet1 from 172.16.37.33 
PIM: Received Join/Prune on Ethernet1 from 172.16.37.33
PIM: Received RP-Reachable on Ethernet1 from 172.16.20.31 
PIM: Update RP expiration timer for 224.2.0.1 
PIM: Forward RP-reachability packet for 224.2.0.1 on Tunnel0 
PIM: Received Join/Prune on Ethernet1 from 172.16.37.33 
PIM: Prune-list (10.221.196.51/32, 224.2.0.1)   
PIM: Set join delay timer to 2 seconds for (10.221.0.0/16, 224.2.0.1) on Ethernet1 
PIM: Received Join/Prune on Ethernet1 from 172.16.37.6 
PIM: Received Join/Prune on Ethernet1 from 172.16.37.33 
PIM: Received Join/Prune on Tunnel0 from 10.3.84.1 
PIM: Join-list: (*, 224.2.0.1) RP 172.16.20.31 
PIM: Add Tunnel0 to (*, 224.2.0.1), Forward state 
PIM: Join-list: (10.0.0.0/8, 224.2.0.1)   
PIM: Add Tunnel0 to (10.0.0.0/8, 224.2.0.1), Forward state 
PIM: Join-list: (10.4.0.0/16, 224.2.0.1)   
PIM: Prune-list (172.16.84.16/28, 224.2.0.1) RP-bit set RP 172.16.84.16 
PIM: Send Prune on Ethernet1 to 172.16.37.6 for (172.16.84.16/28, 224.2.0.1), RP 
PIM: For RP, Prune-list: 10.9.0.0/16 
PIM: For RP, Prune-list: 10.16.0.0/16 
PIM: For RP, Prune-list: 10.49.0.0/16 
PIM: For RP, Prune-list: 10.84.0.0/16 
PIM: For RP, Prune-list: 10.146.0.0/16 
PIM: For 10.3.84.1, Join-list: 172.16.84.16/28 
PIM: Send periodic Join/Prune to RP via 172.16.37.6 (Ethernet1) 
 

The following lines appear periodically when PIM is running in sparse mode and indicate to this router the multicast groups and multicast sources in which other routers are interested:

PIM: Received Join/Prune on Ethernet1 from 172.16.37.33 
PIM: Received Join/Prune on Ethernet1 from 172.16.37.33 

The following lines appear when an RP message is received and the RP timer is reset. The expiration timer sets a checkpoint to make sure the RP still exists. Otherwise, a new RP must be discovered.

PIM: Received RP-Reachable on Ethernet1 from 172.16.20.31 
PIM: Update RP expiration timer for 224.2.0.1 
PIM: Forward RP-reachability packet for 224.2.0.1 on Tunnel0 

The prune message in the following line states that this router is not interested in the SA information. This message tells an upstream router to stop forwarding multicast packets from this source.

PIM: Prune-list (10.221.196.51/32, 224.2.0.1)   

In the following line, a second router on the network wants to override the prune message that the upstream router just received. The timer is set at a random value so that if additional routers on the network still want to receive multicast packets for the group, only one will actually send the message. The other routers will receive the join message and then suppress sending their own message.

PIM: Set join delay timer to 2 seconds for (10.221.0.0/16, 224.2.0.1) on Ethernet1 

In the following line, a join message is sent toward the RP for all sources:

PIM: Join-list: (*, 224.2.0.1) RP 172.16.20.31 

In the following lines, the interface is being added to the outgoing interface (OIF) of the (*, G) and
(S, G) mroute table entry so that packets from the source will be forwarded out that particular interface:

PIM: Add Tunnel0 to (*, 224.2.0.1), Forward state 
PIM: Add Tunnel0 to (10.0.0.0/8, 224.2.0.1), Forward state 

The following line appears in sparse mode only. There are two trees on which data may be received: the RP tree and the source tree. In dense mode there is no RP. After the source and the receiver have discovered one another at the RP, the first hop router for the receiver will usually join to the source tree rather than the RP tree.

PIM: Prune-list (172.16.84.16/28, 224.2.0.1) RP-bit set RP 172.16.84.16 

The send prune message in the next line shows that a router is sending a message to a second router saying that the first router should no longer receive multicast packets for the (S, G). The RP at the end of the message indicates that the router is pruning the RP tree and is most likely joining the source tree, although the router may not have downstream members for the group or downstream routers with members of the group. The output shows the specific sources from which this router no longer wants to receive multicast messages.

PIM: Send Prune on Ethernet1 to 172.16.37.6 for (172.16.84.16/28, 224.2.0.1), RP 

The following lines indicate that a prune message is sent toward the RP so that the router can join the source tree rather than the RP tree:

PIM: For RP, Prune-list: 10.9.0.0/16 
PIM: For RP, Prune-list: 10.16.0.0/16 
PIM: For RP, Prune-list: 10.49.0.0/16 

In the following line, a periodic message is sent toward the RP. The default period is 
once per minute. Prune and join messages are sent toward the RP or source
rather than directly to the RP or source. It is the responsibility of the next hop router 
to take proper action with this message, such as continuing to forward it to the
next router in the tree. 

PIM: Send periodic Join/Prune to RP via 172.16.37.6 (Ethernet1) 

Related Commands

Command
Description

debug ip dvmrp

Displays information on DVMRP packets received and sent.

debug ip igmp

Displays IGMP packets received and sent, and displays IGMP host-related events.

debug ip igrp transactions

Displays transaction information on IGRP routing transactions.

debug ip mrouting

Displays changes to the IP multicast routing table.

debug ip sd

Displays all SD announcements received.


debug ip pim auto-rp

To display the contents of each Protocol Independent Multicast (PIM) packet used in the automatic discovery of group-to-rendezvous point (RP) mapping and the actions taken on the address-to-RP mapping database, use the debug ip pim auto-rp command in privileged EXEC. To disable debugging output, use the no form of this command.

debug ip pim auto-rp [vrf vrf-name]

no debug ip pim auto-rp [vrf vrf-name]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.


Command Modes

Privileged EXEC

Command History

Release
Modification

11.3

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Examples

The following is sample output from the debug ip pim auto-rp command:

Router# debug ip pim auto-rp

Auto-RP: Received RP-announce, from 172.16.214.66, RP_cnt 1, holdtime 180 secs
Auto-RP:  update (192.168.248.0/24, RP:172.16.214.66)
Auto-RP: Build RP-Discovery packet
Auto-RP:  Build mapping (192.168.248.0/24, RP:172.16.214.66),
Auto-RP:  Build mapping (192.168.250.0/24, RP:172.16.214.26).
Auto-RP:  Build mapping (192.168.254.0/24, RP:172.16.214.2).
Auto-RP: Send RP-discovery packet (3 RP entries)
Auto-RP: Build RP-Announce packet for 172.16.214.2
Auto-RP:  Build announce entry for (192.168.254.0/24)
Auto-RP: Send RP-Announce packet, IP source 172.16.214.2, ttl 8

The first two lines show a packet received from 172.16.214.66 announcing that it is the RP for the groups in 192.168.248.0/24. This announcement contains one RP address and is valid for 180 seconds. The RP-mapping agent then updates its mapping database to include the new information.

Auto-RP: Received RP-announce, from 172.16.214.66, RP_cnt 1, holdtime 180 secs
Auto-RP:  update (192.168.248.0/24, RP:172.16.214.66)

In the next five lines, the router creates an RP-discovery packet containing three RP mapping entries. The packet is sent to the well-known CISCO-RP-DISCOVERY group address (224.0.1.40).

Auto-RP: Build RP-Discovery packet
Auto-RP:  Build mapping (192.168.248.0/24, RP:172.16.214.66),
Auto-RP:  Build mapping (192.168.250.0/24, RP:172.16.214.26).
Auto-RP:  Build mapping (192.168.254.0/24, RP:172.16.214.2).
Auto-RP: Send RP-discovery packet (3 RP entries)

The final three lines show the router announcing that it intends to be an RP for the groups in 192.168.254.0/24. Only routers inside the scope ttl 8 receive the advertisement and use the RP for these groups.

Auto-RP: Build RP-Announce packet for 172.16.214.2
Auto-RP:  Build announce entry for (192.168.254.0/24)
Auto-RP: Send RP-Announce packet, IP source 172.16.214.2, ttl 8

The following is sample output from the debug ip pim auto-rp command when a router receives an update. In this example, the packet contains three group-to-RP mappings, which are valid for 180 seconds. The RP-mapping agent then updates its mapping database to include the new information.

Router# debug ip pim auto-rp

Auto-RP: Received RP-discovery, from 172.16.214.17, RP_cnt 3, holdtime 180 secs
Auto-RP:  update (192.168.248.0/24, RP:172.16.214.66)
Auto-RP:  update (192.168.250.0/24, RP:172.16.214.26)
Auto-RP:  update (192.168.254.0/24, RP:172.16.214.2)

ip mroute

To configure a multicast static route (mroute), use the ip mroute command in global configuration mode. To remove the route, use the no form of this command.

ip mroute [vrf vrf-name] source-address mask [protocol as-number] {rpf-address | interface-type interface-number} [distance]

no ip mroute [vrf vrf-name] source mask [protocol as-number] {rpf-address | interface-type interface-number} [distance]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

source-address

IP address of the multicast source.

mask

Mask on the IP address of the multicast source.

protocol

(Optional) Unicast routing protocol that you are using.

as-number

(Optional) Autonomous system number of the routing protocol you are using, if applicable.

rpf-address

Incoming interface for the mroute. If the Reverse Path Forwarding (RPF) address rpf-address is a Protocol Independent Multicast (PIM) neighbor, PIM join, graft, and prune messages are sent to it. The rpf-address argument can be a host IP address of a directly connected system or a network/subnet number. When it is a route, a recursive lookup is done from the unicast routing table to find a directly connected system. If the rpf-address argument is not specified, the interface interface-type interface-number value is used as the incoming interface.

interface-type interface-number

Interface type and number for the mroute.

distance

(Optional) Determines whether a unicast route, a Distance Vector Multicast Routing Protocol (DVMRP) route, or a static mroute should be used for the RPF lookup. The lower distances have better preference. If the static mroute has the same distance as the other two RPF sources, the static mroute will take precedence. The default is 0.


Defaults

distance: 0

Command Modes

Global configuration

Command History

Release
Modification

11.0

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

This command allows you to statically configure where multicast sources are located (even though the unicast routing table shows something different).

When a source range is specified, the rpf-address argument applies only to those sources.

Examples

The following example configures all sources via a single interface (in this case, a tunnel):

ip mroute 224.0.0.0 255.255.255.255 tunnel0

The following example configures all specific sources within a network number to be reachable through 172.30.10.13:

ip mroute 172.16.0.0 255.255.0.0 172.30.10.13

The following example causes this multicast static route to take effect if the unicast routes for any given destination go away:

ip mroute 224.0.0.0 255.255.255.255 serial0 200

ip mroute-cache

To configure IP multicast fast switching or multicast distributed switching (MDS), use the ip mroute-cache command in interface configuration mode. To disable either of these features, use the no form of this command.

ip mroute-cache [distributed]

no ip mroute-cache [distributed]

Syntax Description

distributed

(Optional) Enables MDS on the interface. In the case of RSP, this keyword is optional; if it is omitted, fast switching occurs. On the GSR, this keyword is required because the GSR does only distributed switching.


Defaults

On the RSP, IP multicast fast switching is enabled; MDS is disabled.

On the GSR, MDS is disabled.

Command Modes

Interface configuration

Command History

Release
Modification

10.0

This command was introduced.

11.2(11)GS

The distributed keyword was added.

12.0(23)S

This command was integrated into Cisco IOS Release 12.0(23)S.


Usage Guidelines

The ip mroute-cache command must be enabled on the loopback interface used as the BGP peering interface in order for distributed multicast switching to function on the platforms that support it. The no ip mroute-cache command must not be present on these interfaces.

On the RSP

If multicast fast switching is disabled on an incoming interface for a multicast routing table entry, the packet will be sent at process level for all interfaces in the outgoing interface list.

If multicast fast switching is disabled on an outgoing interface for a multicast routing table entry, the packet is process-level switched for that interface, but may be fast switched for other interfaces in the outgoing interface list.

When multicast fast switching is enabled (like unicast routing), debug messages are not logged. If you want to log debug messages, disable fast switching.

If MDS is not enabled on an incoming interface that is capable of MDS, incoming multicast packets will not be distributed switched; they will be fast switched at the Route Processor (RP) as before. Also, if the incoming interface is not capable of MDS, packets will get fast switched or process-switched at the RP as before.

If MDS is enabled on the incoming interface, but at least one of the outgoing interfaces cannot fast switch, packets will be process-switched. We recommend that you disable fast switching on any interface when MDS is enabled.

On the GSR

On the GSR, all interfaces should be configured for MDS because that is the only switching mode.

Examples

The following example enables IP multicast fast switching on the interface:

ip mroute-cache

The following example disables IP multicast fast switching on the interface:

no ip mroute-cache

The following example enables MDS on the interface:

ip mroute-cache distributed

The following example disables MDS and IP multicast fast switching on the interface:

no ip mroute-cache distributed

ip msdp border

To configure a router that borders a Protocol Independent Multicast (PIM) sparse mode region and dense mode region to use Multicast Source Discovery Protocol (MSDP), use the ip msdp border command in global configuration mode. To prevent this action, use the no form of this command.

ip msdp [vrf vrf-name] border sa-address internet-type internet-number

no ip msdp [vrf vrf-name] border sa-address internet-type internet-number

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

sa-address

Active source IP address.

internet-type internet-number

Interface type and number from which the IP address is derived and used as the rendezvous point (RP) address in Source-Active (SA) messages. Thus, MSDP peers can forward SA messages away from this border. The IP address of the interface is used as the originator ID, which is the RP field in the MSDP SA message.


Defaults

The active sources in the dense mode region will not participate in MSDP.

Command Modes

Global configuration

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

Use this command if you want the router to send SA messages for sources active in the PIM dense mode region to MSDP peers.


Note We recommend configuring the border router in the sparse mode domain to proxy-register sources in the dense mode domain, and have the sparse mode domain use standard MSDP procedures to advertise these sources.



Note If you use this command, you must constrain the sources advertised by using the ip msdp redistribute command. Configure the ip msdp redistribute command to apply to only local sources. Be aware that this configuration can result in (S, G) state remaining long after a source in the dense mode domain has stopped sending.



Note The ip msdp originator-id command also identifies an interface type and number to be used as the RP address. If both the ip msdp border and ip msdp originator-id commands are configured, the latter command prevails. That is, the address derived from the ip msdp originator-id command determines the address of the RP.


Examples

In the following example, the local router is not an RP. It borders a PIM sparse mode region with a dense mode region. It uses the IP address of Ethernet interface 0 as the "RP" address in SA messages.

ip msdp border sa-address ethernet0

Related Commands

Command
Description

ip msdp originator-id

Allows an MSDP speaker that originates an SA message to use the IP address of its interface as the RP address in the SA message.

ip msdp redistribute

Configures which (S, G) entries from the multicast routing table are advertised in SA messages originated to MSDP peers.


ip msdp cache-sa-state

To have the router create Source-Active (SA) state, use the ip msdp cache-sa-state command in global configuration mode.

ip msdp cache-sa-state [vrf vrf-name]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.


Defaults

The router creates SA state for all Multicast Source Discovery Protocol (MSDP) SA messages it receives.

Command Modes

Global configuration

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.1(7)

This command was modified such that it is enabled by default and cannot be disabled.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

This command is automatically configured if at least one MSDP peer is configured. It cannot be disabled.

If you are running a version of Cisco IOS software prior to Release 12.1(7), we recommend enabling the ip msdp cache-sa-state command.

Examples

The following example shows how the ip msdp cache-sa-state command is enabled when an MSDP peer is configured.

.
.
.
ip classless
ip msdp peer 224.168.1.2 connect-source Loopback0
ip msdp peer 224.169.1.7
ip msdp mesh-group outside-test 192.168.1.2
ip msdp cache-sa-state
ip msdp originator-id Loopback0
.
.

Related Commands

Command
Description

clear ip msdp sa-cache

Clears MSDP SA cache entries.

ip msdp sa-request

Configures the router to send SA request messages to the MSDP peer when a new joiner from the group becomes active.

show ip msdp sa-cache

Displays (S, G) state learned from MSDP peers.


ip msdp default-peer

To define a default peer from which to accept all Multicast Source Discovery Protocol (MSDP) Source-Active (SA) messages, use the ip msdp default-peer command in global configuration mode. To remove the default peer, use the no form of this command.

ip msdp [vrf vrf-name] default-peer {peer-address | peer-name} [prefix-list list]

no ip msdp [vrf vrf-name] default-peer

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

peer-address | peer-name

IP address or Domain Name System (DNS) name of the MSDP default peer.

prefix-list list

(Optional) Border Gateway Protocol (BGP) prefix list that specifies that the peer will be a default peer only for the prefixes listed in the list specified by the list argument. A BGP prefix list must be configured for this prefix-list list keyword and argument to have any effect.


Defaults

No default MSDP peer exists.

Command Modes

Global configuration

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

Use the ip msdp default-peer command if you do not want to configure your MSDP peer to be a BGP peer also.

If only one MSDP peer is configured (with the ip msdp peer command), it will be used as a default peer. Therefore, you need not configure a default peer with this command.

If the prefix-list list keyword and argument are not specified, all SA messages received from the configured default peer are accepted.

Remember to configure a BGP prefix list if you intend to configure the prefix-list list keyword and argument with the ip msdp default-peer command.

If the prefix-list list keyword and argument are specified, SA messages originated from rendezvous points (RPs) covered by the prefix-list list keyword and argument will be accepted from the configured default peer. If the prefix-list list keyword and argument are specified but no prefix list is configured, the default peer will be used for all prefixes.

You can enter multiple ip msdp default-peer commands, with or without the prefix-list keyword, as follows. However, all commands must either have the keyword or all must not have the keyword.

When you use multiple ip msdp default-peer commands with the prefix-list keyword, you use all the default peers at the same time for different RP prefixes. This syntax is typically used in a service provider cloud that connects stub site clouds.

When you use multiple ip msdp default-peer commands without the prefix-list keyword, you use a single active peer to accept all SA messages. If that peer goes down, then you move to the next configured default peer to accept all SA messages. This syntax is typically used at a stub site.

Examples

The following example configures the router named router.cisco.com as the default peer to the local router:

ip msdp peer 224.12.2.3
ip msdp peer 224.13.4.5
ip msdp default-peer router.cisco.com    !At a stub site

The following example configures two default peers:

ip msdp peer 224.12.2.3
ip msdp peer 224.13.4.5
ip msdp default-peer 224.12.2.3 prefix-list site-c
ip prefix-list site-a permit 224.12.0.0/16
ip msdp default-peer 224.13.4.5 prefix-list site-a
ip prefix-list site-a permit 224.13.0.0/16

Related Commands

Command
Description

ip msdp peer

Configures an MSDP peer.

ip prefix-list

Creates a prefix list.


ip msdp description

To add descriptive text to the configuration for a Multicast Source Discovery Protocol (MSDP) peer, use the ip msdp description command in global configuration mode. To remove the description, use the no form of this command.

ip msdp [vrf vrf-name] description {peer-name | peer-address} text

no ip msdp [vrf vrf-name] description {peer-name | peer-address}

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

peer-name | peer-address

Peer name or address to which this description applies.

text

Description of the MSDP peer.


Defaults

No description is associated with an MSDP peer.

Command Modes

Global configuration

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

Configure a description to make the MSDP peer easier to identify. This description is displayed in the output of the show ip msdp peer command.

Examples

The following example configures the router at the IP address 224.107.5.4 with a description indicating it is a router at customer A:

ip msdp description 224.107.5.4 router at customer a

ip msdp filter-sa-request

To configure the router to send Source-Active (SA) request messages to the Multicast Source Discovery Protocol (MSDP) peer when a new joiner from a group becomes active, use the ip msdp filter-sa-request command in global configuration mode. To prevent this action, use the no form of this command.

ip msdp [vrf vrf-name] filter-sa-request {peer-address | peer-name} [list access-list]

no ip msdp [vrf vrf-name] filter-sa-request {peer-address | peer-name}

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

peer-address | peer-name

IP address or name of the MSDP peer from which the local router requests SA messages when a new joiner for the group becomes active.

list access-list

(Optional) Standard IP access list number or name that describes a multicast group address. If no access list is specified, all SA request messages are ignored.


Defaults

If this command is not configured, all SA request messages are honored. If this command is configured but no access list is specified, all SA request messages are ignored.

Command Modes

Global configuration

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

By default, the router honors all SA request messages from peers. Use this command if you want to control exactly which SA request messages the router will honor.

If no access list is specified, all SA request messages are ignored. If an access list is specified, only SA request messages from those groups permitted will be honored, and all others will be ignored.

Examples

The following example configures the router to filter SA request messages from the MSDP peer at 172.16.2.2. SA request messages from sources on the network 192.168.22.0 pass access list 1 and will be honored; all others will be ignored.

ip msdp filter sa-request 224.69.2.2 list 1
access-list 1 permit 228.4.22.0 0.0.0.255

Related Commands

Command
Description

ip msdp peer

Configures an MSDP peer.


ip msdp mesh-group

To configure a Multicast Source Discovery Protocol (MSDP) peer to be a member of a mesh group, use the ip msdp mesh-group command in global configuration mode. To remove an MSDP peer from a mesh group, use the no form of this command.

ip msdp [vrf vrf-name] mesh-group mesh-name {peer-address | peer-name}

no ip msdp [vrf vrf-name] mesh-group mesh-name {peer-address | peer-name}

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

mesh-name

Name of the mesh group.

peer-address | peer-name

IP address or name of the MSDP peer to be a member of the mesh group.


Defaults

The MSDP peers do not belong to a mesh group.

Command Modes

Global configuration

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

A mesh group is a group of MSDP speakers that have fully meshed MSDP connectivity among themselves. Source-Active (SA) messages received from a peer in a mesh group are not forwarded to other peers in the same mesh group.

Mesh groups can be used to achieve two goals:

To reduce SA message flooding

To simplify peer-Reverse Path Forwarding (RPF) flooding (no need to run Border Gateway Protocol [BGP] or multiprotocol BGP among MSDP peers)

Examples

The following example configures the MSDP peer at address 224.1.1.1 to be a member of the mesh group named internal:

ip msdp mesh-group internal 224.1.1.1

ip msdp originator-id

To allow a Multicast Source Discovery Protocol (MSDP) speaker that originates a Source-Active (SA) message to use the IP address of the interface as the rendezvous point (RP) address in the SA message, use the ip msdp originator-id command in global configuration mode. To prevent the RP address from being derived in this way, use the no form of this command.

ip msdp [vrf vrf-name] originator-id interface-type interface-number

no ip msdp [vrf vrf-name] originator-id interface-type interface-number

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

interface-type interface-number

Interface type and number on the local router, whose IP address is used as the RP address in SA messages.


Defaults

The RP address is used as the originator ID.

Command Modes

Global configuration

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

The ip msdp originator-id command identifies an interface type and number to be used as the RP address in an SA message.

Use this command if you want to configure a logical RP. Because only RPs and MSDP border routers originate SAs, there are times when it is necessary to change the ID used for this purpose.

If both the ip msdp border sa-address and ip msdp originator-id commands are configured, the latter command prevails. That is, the address derived from the ip msdp originator-id command determines the address of the RP to be used in the SA message.

Examples

The following example configures the IP address of Ethernet interface 1 as the RP address in SA messages:

ip msdp originator-id ethernet1



Related Commands

Command
Description

ip msdp border

Configures a router that borders a PIM sparse mode region and dense mode region to use MSDP.


ip msdp peer

To configure a Multicast Source Discovery Protocol (MSDP) peer, use the ip msdp peer command in global configuration mode. To remove the peer relationship, use the no form of this command.

ip msdp [vrf vrf-name] peer {peer-name | peer-address} [connect-source interface-type interface-number] [remote-as as-number]

no ip msdp [vrf vrf-name] peer{peer-name | peer-address}

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

peer-name | peer-address

Domain Name System (DNS) name or IP address of the router that is to be the MSDP peer.

connect-source interface-type interface-number

(Optional) Interface type and number whose primary address becomes the source IP address for the TCP connection. This interface is on the router being configured.

remote-as as-number

(Optional) Autonomous system number of the MSDP peer. This is used for display purposes only.

There are cases where a peer might appear to be in another autonomous system (other than the one it really resides in) when you have an MSDP peering session but do not have a BGP peer session with that peer. In this case, if the prefix of the peer is injected by another autonomous system, it is displayed as the autonomous system number of the peer (and is misleading).


Defaults

No MSDP peer is configured.

Command Modes

Global configuration

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

The router specified should also be configured as a BGP neighbor.

If you are also BGP peering with this MSDP peer, you should use the same IP address for MSDP as you do for BGP. However, you are not required to run BGP or multiprotocol BGP with the MSDP peer, as long as there is a BGP or MBGP path between the MSDP peers. If there is no path, you must configure the ip msdp default-peer command.

Examples

The following example configures the router at the IP address 224.108.1.2 as an MSDP peer to the local router. The neighbor belongs to autonomous system 109.

ip msdp peer 224.108.1.2 connect-source ethernet 0
router bgp 110
 network 224.108.0.0
 neighbor 224.108.1.2 remote-as 109
 neighbor 224.108.1.2 update-source ethernet 0

The following example configures the router named router.cisco.com as an MSDP peer to the local router:

ip msdp peer router.cisco.com

The following example configures the router named router.cisco.com to be an MSDP peer in autonomous system 109. The primary address of Ethernet interface 0 is used as the source address for the TCP connection.

ip msdp peer router.cisco.com connect-source ethernet0 remote-as 109

Related Commands

Command
Description

neighbor remote-as

Adds an entry to the BGP neighbor table.


ip msdp redistribute

To configure which (S, G) entries from the multicast routing table are advertised in Source-Active (SA) messages originated to Multicast Source Discovery Protocol (MSDP) peers, use the ip msdp redistribute command in global configuration mode. To remove the filter, use the no form of this command.

ip msdp [vrf vrf-name] redistribute [list access-list-name] [asn as-access-list-number] [route-map map-name]

no ip msdp [vrf vrf-name] redistribute

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

list access-list-name

(Optional) Standard or extended IP access list number or name that controls which local sources are advertised and to which groups they send.

asn as-access-list-number

(Optional) Standard or extended IP access list number in the range from 1 to 199. This access list number must also be configured in the ip as-path command.

route-map map-name

(Optional) Defines the route map.


Defaults

If no portion of this command is configured, only local sources are advertised, provided they send to groups for which the router is a rendezvous point (RP).

If no portion of this command is configured and if the ip msdp border sa-address command is configured, all local sources are advertised.

If the ip msdp redistribute command is configured with no keywords, no multicast sources are advertised.

Command Modes

Global configuration

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

This command affects SA message origination, not SA message forwarding. If you want to filter which SA messages are forwarded to MSDP peers, use the ip msdp sa-filter in or ip msdp sa-filter out command.

The ip msdp redistribute command controls which (S, G) pairs the router advertises from the multicast routing table. By default, only sources within the local domain are advertised. Use the following guidelines for the ip msdp redistribute command:

If you specify the list access-list-name keyword and argument only, you filter which local sources are advertised and to which groups they send. The access list specifies a source address, source mask, group address, and group mask.

If you specify the asn as-access-list-number keyword and argument only, you advertise all sources sending to any group that pass through the autonomous system path access list. The autonomous system path access list number refers to the ip as-path command, which specifies an access list. If the asn 0 keywords are specified, sources from all autonomous systems are advertised. The asn 0 keywords are useful when connecting dense mode domains to a sparse mode domain running MSDP, or when using MSDP in a router that is not configured with Border Gateway Protocol (BGP). In these cases, you do not know if a source is local.

If you specify the route-map map-name keyword and argument only, you advertise all sources that satisfy the match criteria in the route map map-name argument.

If you specify all three keywords (list, asn, and route-map), all conditions must be true before any multicast source is advertised in an SA message.

If you specify the ip multicast redistribute command with no other keywords or arguments, no multicast sources are advertised.

Examples

The following example configures which (S, G) entries from the multicast routing table are advertised in SA messages originated to MSDP peers:

ip msdp redistribute route-map customer-sources

route-map customer-sources permit
match as-path customer-as

ip as-path access-list ^109$

Related Commands

Command
Description

ip as-path

Defines a BGP-related access list.

ip msdp border

Configures a router that borders a PIM sparse mode region and dense mode region to use MSDP.


ip msdp sa-filter in

To configure an incoming filter list for Source-Active (SA) messages received from the specified Multicast Source Discovery Protocol (MSDP) peer, use the ip msdp sa-filter in command in global configuration mode. To remove the filter, use the no form of this command.

ip msdp [vrf vrf-name] sa-filter in {peer-address | peer-name} [list access-list-name] [route-map map-name]

no ip msdp [vrf vrf-name] sa-filter in {peer-address | peer-name} [list access-list-name] [route-map map-name]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

peer-address | peer-name

IP address or name of the MSDP peer from which the SA messages are filtered.

list access-list-name

(Optional) IP access list number or name. If no access list is specified, all source/group pairs from the peer are filtered.

route-map map-name

(Optional) Route map name. From the specified MSDP peer, passes only those SA messages that meet the match criteria in the route map map-name argument.

If all match criteria are true, a permit keyword from the route map will pass routes through the filter. A deny keyword will filter routes.


Defaults

If this command is not configured, no incoming messages are filtered; all SA messages are accepted from the peer.

If the command is configured, but no access list or route map is specified, all source/group pairs from the peer are filtered.

If both the list and route-map keywords are used, all conditions must be true to pass any (S, G) pair in incoming SA messages.

Command Modes

Global configuration

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Examples

The following example configures the router to filter all SA messages from the peer named router.cisco.com:

ip msdp peer router.cisco.com connect-source ethernet 0
ip msdp sa-filter in router.cisco.com

Related Commands

Command
Description

ip msdp peer

Configures an MSDP peer.

ip msdp sa-filter out

Configures an outgoing filter list for SA messages sent to the specified MSDP peer.


ip msdp sa-filter out

To configure an outgoing filter list for Source-Active (SA) messages sent to the specified Multicast Source Discovery Protocol (MSDP) peer, use the ip msdp sa-filter out command in global configuration mode. To remove the filter, use the no form of this command.

ip msdp [vrf vrf-name] sa-filter out {peer-address | peer-name} [list access-list-name] [route-map map-name]

no ip msdp [vrf vrf-name] sa-filter out {peer-address | peer-name} [list access-list-name] [route-map map-name]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

peer-address | peer-name

IP address or Domain Name System (DNS) name of the MSDP peer to which the SA messages are filtered.

list access-list

(Optional) Extended IP access list number or name. If no access list is specified, all source/group pairs are filtered. To the specified MSDP peer, passes only those SA messages that pass the extended access list.

If both the list and route-map keywords are used, all conditions must be true to pass any (S, G) pairs in outgoing SA messages.

route-map map-name

(Optional) Route map name. To the specified MSDP peer, passes only those SA messages that meet the match criteria in the route map map-name argument.

If all match criteria are true, a permit keyword from the route map will pass routes through the filter. A deny keyword will filter routes.


Defaults

If this command is not configured, no outgoing messages are filtered; all SA messages received are forwarded to the peer.

If the command is configured, but no access list or route map is specified, all source/group pairs are filtered.

If both the list and route-map keywords are used, all conditions must be true to pass any (S, G) pairs in outgoing SA messages.

Command Modes

Global configuration

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Examples

The following example allows only (S, G) pairs that pass access list 100 to be forwarded in an SA message to the peer named router.cisco.com:

ip msdp peer router.cisco.com connect-source ethernet 0
ip msdp sa-filter out router.cisco.com list 100
access-list 100 permit ip 224.69.0.0 0.0.255.255 224.2.0.0 0.0.255.255

Related Commands

Command
Description

ip msdp peer

Configures an MSDP peer.

ip msdp sa-filter in

Configures an incoming filter list for SA messages received from the specified MSDP peer.


ip msdp sa-request

To configure the router to send Source-Active (SA) request messages to the Multicast Source Discovery Protocol (MSDP) peer when a new joiner from the group becomes active, use the ip msdp sa-request command in global configuration mode. To prevent this action, use the no form of this command.

ip msdp [vrf vrf-name] sa-request {peer-address | peer-name}

no ip msdp [vrf vrf-name] sa-request {peer-address | peer-name}

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

peer-address | peer-name

IP address or name of the MSDP peer from which the local router requests SA messages when a new joiner for the group becomes active.


Defaults

The router does not send SA request messages to the MSDP peer.

Command Modes

Global configuration

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

By default, the router does not send any SA request messages to its MSDP peers when a new member joins a group and wants to receive multicast traffic. The new member waits to receive any SA messages that eventually arrive.

Use this command if you want a new member of a group to learn the current, active multicast sources in a connected Protocol Independent Multicast sparse mode (PIM-SM) domain that are sending to a group. The router will send SA request messages to the specified MSDP peer when a new member joins a group. The peer replies with the information in its SA cache. If the peer does not have a cache configured, this command provides nothing.

An alternative to this command is using the ip msdp cache-sa-state command to have the router cache messages.

Examples

The following example configures the router to send SA request messages to the MSDP peer at 224.69.1.1:

ip msdp sa-request 224.69.1.1

Related Commands

Command
Description

ip mdsp cache-sa-state

Enables the router to create SA state.

ip msdp peer

Configures an MSDP peer.


ip msdp shutdown

To administratively shut down a configured Multicast Source Discovery Protocol (MSDP) peer, use the ip msdp shutdown command in global configuration mode. To bring the peer back up, use the no form of this command.

ip msdp [vrf vrf-name] shutdown {peer-address | peer-name}

no ip msdp [vrf vrf-name] shutdown {peer-address | peer-name}

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

peer-address | peer-name

IP address or name of the MSDP peer to shut down.


Defaults

No action is taken to shut down an MSDP peer.

Command Modes

Global configuration

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Examples

The following example shuts down the MSDP peer at IP address 224.5.7.20:

ip msdp shutdown 224.5.7.20

Related Commands

Command
Description

ip msdp peer

Configures an MSDP peer.


ip msdp ttl-threshold

To limit which multicast data packets are sent in Source-Active (SA) messages to a Multicast Source Discovery Protocol (MSDP) peer, use the ip msdp ttl-threshold command in global configuration mode. To restore the default value, use the no form of this command.

ip msdp [vrf vrf-name] ttl-threshold {peer-address | peer-name} ttl-value

no ip msdp [vrf vrf-name] ttl-threshold {peer-address | peer-name}

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

peer-address | peer-name

IP address or name of the MSDP peer to which the ttl-value argument applies.

ttl-value

Time-to-live (TTL) value. The default value of the ttl-value argument is 0, meaning all multicast data packets are forwarded to the peer until the TTL is exhausted.


Defaults

ttl-value: 0

Command Modes

Global configuration

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

This command limits which multicast data packets are sent in data-encapsulated SA messages. Only multicast packets with an IP header TTL greater than or equal to the ttl-value argument are sent to the MSDP peer specified by the IP address or name.

Use this command if you want to use TTL to scope your multicast data traffic. For example, you could limit internal traffic to a TTL of 8. If you want other groups to go to external locations, you would need to send those packets with a TTL greater than 8.

Examples

The following example configures a TTL threshold of 8 hops:

ip msdp ttl-threshold 224.5.7.20 8

Related Commands

Command
Description

ip msdp peer

Configures an MSDP peer.


ip multicast cache-headers

To allocate a circular buffer to store IP multicast packet headers that the router receives, use the ip multicast cache-headers command in global configuration mode. To remove the buffer, use the no form of this command.

ip multicast [vrf vrf-name] cache-headers [rtp]

no ip multicast [vrf vrf-name] cache-headers

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

rtp

(Optional) Caches Real-Time Transport Protocol (RTP) headers.


Defaults

The command is disabled.

Command Modes

Global configuration

Command History

Release
Modification

11.1

This command was introduced.

12.1

The rtp keyword was added.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

You can store IP multicast packet headers in a cache and then display them to determine the following information:

Who is sending IP multicast packets to which groups

Interpacket delay

Duplicate IP multicast packets (if any)

Multicast forwarding loops in your network (if any)

Scope of the group

UDP port numbers

Packet length


Note This command allocates a circular buffer of approximately 32 KB. Do not configure this command if you are low on memory.


Use the show ip mpacket command to display the buffer.

Examples

The following example allocates a buffer to store IP multicast packet headers:

ip multicast cache-headers

Related Commands

Command
Description

show ip mpacket

Displays the contents of the circular cache-header buffer.


ip multicast mrinfo-filter

To filter multicast router information request packets, use the ip multicast mrinfo-filter command in global configuration mode. To disable this configuration, use the no form of this command.

ip multicast mrinfo-filter access-list

no ip multicast mrinfo-filter access-list

Syntax Description

access-list

Access list of the source IP address to be filtered.


Defaults

No default behavior or values.

Command Modes

Global configuration

Command History

Release
Modification

12.0(23)S

This command was introduced.


Usage Guidelines

The ip multicast mrinfo-filter command filters the mrinfo request packets for all of the sources listed in the specified access list.

Examples

The following example specifies that mrinfo request packets be filtered for all sources listed in access list number 4.

ip multicast mrinfo-filter 4

ip multicast multipath

To enable load splitting of IP multicast traffic across multiple equal-cost paths, use the ip multicast multipath command in global configuration mode. To disable this configuration, use the no form of this command.

ip multicast [vrf vrf-name] multipath

no ip multicast [vrf vrf-name] multipath

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.


Defaults

By default, if multiple equal-cost paths exist, multicast traffic will not be load split across these paths.

Command Modes

Global configuration

Command History

Release
Modification

12.0(8)T

This command was introduced.

12.0(5)S

This command was integrated into Cisco IOS Release 12.0(5)S.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

If the ip multicast multipath command is configured and multiple equal-cost paths exist, load splitting will occur across the equal-cost paths for multicast traffic from different sources to the same multicast group, but not for traffic from the same source to different multicast groups. Because this command changes the way a Reverse Path Forwarding (RPF) neighbor is selected, it must be configured consistently on all routers in a redundant topology to avoid looping.

Examples

The following example shows how to configure the ip multicast multipath command:

ip multicast multipath

Related Commands

Command
Description

show ip rpf

Displays how IP multicast routing does RPF.


ip multicast route-limit

To limit the number of multicast routes that can be added to a multicast routing table, use the ip multicast route-limit command in global configuration mode. To disable this configuration, use the no form of this command.

ip multicast [vrf vrf-name] route-limit limit [threshold]

no ip multicast [vrf vrf-name] route-limit limit [threshold]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

limit

The number of mroutes that can be added. The range is from 1 to 2147483647.

threshold

(Optional) The number of mroutes that cause a warning message to occur. The threshold value must not exceed the limit value.


Defaults

2147483647

Command Modes

Global configuration

Command History

Release
Modification

12.0(23)S

This command was introduced.


Usage Guidelines

The ip multicast route-limit command limits the number of multicast routes that can be added to a router and generates an error message when the limit is exceeded. If the user sets the threshold argument, a threshold error message is generated when the threshold is exceeded, and the message continues to occur until the number of mroutes reaches the limit set by the limit argument.

The mroute warning threshold must not exceed the mroute limit.

Examples

The following example sets the mroute limit at 200,000 and the threshold at 20,000 for a VRF instance named cisco:

ip multicast vrf cisco route-limit 200000 20000

ip multicast-routing

To enable IP multicast routing, use the ip multicast-routing command in global configuration mode. To disable IP multicast routing, use the no form of this command.

ip multicast-routing [vrf vrf-name] [distributed]

no ip multicast-routing [vrf vrf-name]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

distributed

(Optional) Enables Multicast Distributed Switching (MDS).


Defaults

This command is disabled.

Command Modes

Global configuration

Command History

Release
Modification

10.0

This command was introduced.

11.2(11)GS

The distributed keyword was added.

12.0(5)T

The effect of this command was modified. If IP multicast Multilayer Switching (MLS) is enabled, using the no form of this command now disables IP multicast routing on the Multicast Multilayer Switching (MMLS) route processor (RP) and purges all multicast MLS cache entries on the MMLS-SE.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

When IP multicast routing is disabled, the Cisco IOS software does not forward any multicast packets.

Examples

The following example enables IP multicast routing:

ip multicast-routing

Related Commands

Command
Description

ip pim

Enables PIM on an interface.


ip pim accept-register

To configure a candidate rendezvous point (RP) router to filter Protocol Independent Multicast (PIM) register messages, use the ip pim accept-register command in global configuration mode. To disable this function, use the no form of this command.

ip pim [vrf vrf-name] accept-register {list access-list | route-map map-name}

no ip pim [vrf vrf-name] accept-register {list access-list | route-map map-name}

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

list access-list

Defines the extended access list number or name.

route-map map-name

Defines the route map.


Defaults

The command is disabled.

Command Modes

Global configuration

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

Use this command to prevent unauthorized sources from registering with the RP. If an unauthorized source sends a register message to the RP, the RP will immediately send back a register-stop message.

Examples

The following example shows how to restrict the RP from allowing sources in the Source Specific Multicast (SSM) range of addresses to register with the RP. These statements need to be configured only on the RP.

ip pim accept-register list no-ssm-range

ip access-list extended no-ssm-range
 deny ip any 232.0.0.0 0.255.255.255
 permit ip any any

ip pim accept-rp

To configure a router to accept join or prune messages destined for a specified rendezvous point (RP) and for a specific list of groups, use the ip pim accept-rp command in global configuration mode. To remove that check, use the no form of this command.

ip pim [vrf vrf-name] accept-rp {rp-address | auto-rp} [access-list]

no ip pim [vrf vrf-name] accept-rp {rp-address | auto-rp} [access-list]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

rp-address

RP address of the RP allowed to send join messages to groups in the range specified by the group access list.

auto-rp

Join and register messages are accepted only for RPs that are in the Auto-RP cache.

access-list

(Optional) Access list number or name that defines which groups are subject to the check.


Defaults

Command is disabled, so all join messages and prune messages are processed.

Command Modes

Global configuration

Command History

Release
Modification

10.2

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

This command causes the router to accept only (*, G) join messages destined for the specified RP address. Additionally, the group address must be in the range specified by the access list.

When the rp-address argument is one of the addresses of the system, the system will be the RP only for the specified group range specified by the access list. When the group address is not in the group range, the RP will not accept join or register messages and will respond immediately to register messages with register-stop messages.

Examples

The following example states that the router will accept join or prune messages destined for the RP at address 172.17.1.1 for the multicast group 224.2.2.2:

ip pim accept-rp 172.17.1.1 3
access-list 3 permit 224.2.2.2

Related Commands

Command
Description

access-list (IP standard)

Defines a standard IP access list.


ip pim bidir-enable

To enable bidirectional Protocol Independent Multicast (bidir-PIM), use the ip pim bidir-enable command in global configuration mode. To disable bidir-PIM, use the no form of this command.

ip pim [vrf vrf-name] bidir-enable

no ip pim [vrf vrf-name] bidir-enable

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.


Defaults

Command is disabled.

Command Modes

Global configuration

Command History

Release
Modification

12.0(18)ST

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

Bidir-PIM is disabled by default to ensure complete backward compatibility when upgrading a router to Cisco IOS Release 12.0(18)ST or a later release.

When bidir-PIM is disabled, the router will behave similarly to a router without bidir-PIM support. The following conditions will apply:

PIM hello messages sent by the router will not contain the bidirectional mode option.

The router will not send designated forwarder (DF) election messages and will ignore DF election messages it receives.

The ip pim rp-address, ip pim send-rp-announce, and ip pim rp-candidate global configuration commands will be treated as follows:

If these commands are configured when bidir-PIM is disabled, bidirectional mode will not be a configuration option.

If these commands are configured with the bidirectional mode option when bidir-PIM is enabled and then bidir-PIM is disabled, these commands will be removed from the command-line interface (CLI). In this situation, these commands must be configured again with the bidirectional mode option when bidir-PIM is reenabled.

The df keyword for the show ip pim interface EXEC command and debug ip pim privileged EXEC command is not supported.

Examples

The following example shows how to configure a rendezvous point (RP) for both sparse mode and bidirectional mode groups: 224/8 and 227/8 are bidirectional groups, 226/8 is sparse mode, and 225/8 is dense mode. The RP must be configured to use different IP addresses for the sparse mode and bidirectional mode operations. Two loopback interfaces are used to allow this configuration. The addresses of these loopback interfaces must be routed throughout the PIM domain such that the other routers in the PIM domain can receive Auto-RP announcements and communicate with the RP.

ip multicast-routing !Enable IP multicast routing
ip pim bidir-enable  !Enable bidir-PIM
!
interface loopback 0
description One Loopback adddress for this routers Bidir Mode RP function
ip address 10.0.1.1 255.255.255.0
 ip pim sparse-dense-mode
!
interface loopback 1
 description One Loopback adddress for this routers Sparse Mode RP function
 ip address 10.0.2.1 255.255.255.0
 ip pim sparse-dense-mode
 
ip pim send-rp-announce Loopback0 scope 10 group-list 45 bidir
ip pim send-rp-announce Loopback1 scope 10 group-list 46
ip pim send-rp-discovery scope 10
 
access-list 45 permit 224.0.0.0 0.255.255.255
access-list 45 permit 227.0.0.0 0.255.255.255
access-list 45 deny   225.0.0.0 0.255.255.255
 
access-list 46 permit 226.0.0.0 0.255.255.255

Related Commands

Command
Description

ip pim rp-address

Configures the address of a PIM RP for a particular group.

ip pim rp-candidate

Configures the router to advertise itself as a PIM Version 2 candidate RP to the BSR.

ip pm send-rp-announce

Uses Auto-RP to configure for which groups the router is willing to act as RP.


ip pim bsr-candidate

To configure the router to announce its candidacy as a bootstrap router (BSR), use the ip pim bsr-candidate command in global configuration mode. To remove this router as a candidate for being a bootstrap router, use the no form of this command.

ip pim [vrf vrf-name] bsr-candidate interface-type interface-number [hash-mask-length] [priority]

no ip pim [vrf vrf-name] bsr-candidate

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

interface-type interface-number

Interface type and number on this router from which the BSR address is derived, to make it a candidate. This interface must be enabled with Protocol Independent Multicast (PIM).

hash-mask-length

(Optional) Length of a mask (32 bits maximum) that is to be ANDed with the group address before the hash function is called. All groups with the same seed hash (correspond) to the same RP. For example, if this value is 24, only the first 24 bits of the group addresses matter. This fact allows you to get one RP for multiple groups.

priority

(Optional) Integer from 0 to 255. The BSR with the larger priority is preferred. If the priority values are the same, the router with the larger IP address is the BSR. The default value is 0.


Defaults

Command is disabled.

Command Modes

Global configuration

Command History

Release
Modification

11.3 T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

This command causes the router to send bootstrap messages to all its PIM neighbors, with the address of the designated interface as the BSR address. Each neighbor compares the BSR address with the address it had from previous bootstrap messages (not necessarily received on the same interface). If the current address is the same or higher address, it caches the current address and forwards the bootstrap message. Otherwise, it drops the bootstrap message.

This router continues to be the BSR until it receives a bootstrap message from another candidate BSR saying that it has a higher priority (or if the same priority, a higher IP address).

Use this command only in backbone routers that have good connectivity to all parts of the PIM domain. That is, a stub router that relies on an on-demand dialup link to connect to the rest of the PIM domain is not a good candidate BSR.

Examples

The following example configures the IP address of the router on Ethernet interface 0 to be a candidate BSR with priority of 10:

ip pim bsr-candidate ethernet 0 10

Related Commands

Command
Description

ip pim border

Configures the interface to be the PIM domain border.

ip pim rp-candidate

Configures the router to advertise itself as a PIM Version 2 candidate RP to the BSR.

ip pim send-rp-discovery

Configures the router to be an RP-mapping agent.

show ip pim bsr

Displays the BSR information.

show ip pim rp

Displays active RPs that are cached with associated multicast routing entries.


ip pim register-rate-limit

To set a limit on the maximum number of Protocol Independent Multicast sparse mode (PIM-SM) register messages sent per second for each (S, G) routing entry, use the ip pim register-rate-limit command in global configuration mode. To disable this limit, use the no form of this command.

ip pim [vrf vrf-name] register-rate-limit rate

no ip pim [vrf vrf-name] register-rate-limit

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

rate

Maximum number of register messages sent per second by the router. If no limit is defined, the router will not limit the rate of register messages sent.


Defaults

No limit is defined.

Command Modes

Global configuration

Command History

Release
Modification

11.3 T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

Use this command to limit the number of register messages that the designated router (DR) will allow for each (S, G) entry. Enabling this command will limit the load on the DR and RP at the expense of dropping those register messages that exceed the set limit. Receivers may experience data packet loss within the first second in which register messages are sent from bursty sources.

If the ip pim dense-mode proxy-register command is configured, then the ip pim register-rate-limit command must be configured because of the potentially large number of sources from the dense mode area that may send data into the sparse mode region (and thus need registering in the border router).

This command applies only to sparse mode (S, G) multicast routing entries.

Examples

The following example shows how to configure the ip pim register-rate-limit command with a maximum rate of two register messages per second:

ip pim register-rate-limit 2

Related Commands

Command
Description

ip pim

Enables PIM on an interface.


ip pim register-source

To configure the IP source address of a register message to an interface address other than the outgoing interface address of the designated router (DR) leading toward the rendezvous point (RP), use the ip pim register-source command in global configuration mode. To disable this configuration, use the no form of this command.

ip pim [vrf vrf-name] register-source interface-type interface-number

no ip pim [vrf vrf-name] register-source

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

interface-type interface-number

Interface type and interface number that identify the IP source address of a register message.


Defaults

By default, the IP address of the outgoing interface of the DR leading toward the RP is used as the IP source address of a register message.

Command Modes

Global configuration

Command History

Release
Modification

12.0(8)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

This command is required only when the IP source address of a register message is not a uniquely routed address to which the RP can send packets. This situation may occur if the source address is filtered such that packets sent to it will not be forwarded or if the source address is not unique to the network. In these cases, the replies sent from the RP to the source address will fail to reach the DR, resulting in Protocol Independent Multicast sparse mode (PIM-SM) protocol failures.

If no IP source address is configured or if the configured source address is not in service, the IP address of the outgoing interface of the DR leading toward the RP is used as the IP source address of the register message. Therefore, we recommend using a loopback interface with an IP address that is uniquely routed throughout the PIM-SM domain.

Examples

The following example shows how to configure the IP source address of the register message to the loopback 3 interface of a DR:

ip pim register-source loopback 3

ip pim rp-announce-filter

To filter incoming Auto-RP announcement messages coming from the rendezvous point (RP), use the ip pim rp-announce-filter command in global configuration mode. To remove the filter, use the no form of this command.

ip pim [vrf vrf-name] rp-announce-filter rp-list access-list group-list access-list

no ip pim [vrf vrf-name] rp-announce-filter rp-list access-list group-list access-list

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

rp-list access-list

Number or name of a standard access list of RP addresses that are allowable for the group ranges supplied in the group-list access-list combination.

group-list access-list

Number or name of a standard access list that describes the multicast groups the RPs serve.


Defaults

All RP announcements are accepted.

Command Modes

Global configuration

Command History

Release
Modification

11.1

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

Configure this command on the Protocol Independent Multicast (PIM) RP mapping agent. We recommend that if you use more than one RP mapping agent, make the filters among them consistent so that there are no conflicts in mapping state when the announcing agent goes down.

Examples

The following example configures the router to accept RP announcements from RPs in access list 1 for group ranges described in access list 2:

ip pim rp-announce-filter rp-list 1 group-list 2
access-list 1 permit 10.0.0.1
access-list 1 permit 10.0.0.2
access-list 2 permit 224.0.0.0 192.168.255.255

Related Commands

Command
Description

access-list (IP standard)

Defines a standard IP access list.


ip pim rp-candidate

To configure the router to advertise itself as a Protocol Independent Multicast (PIM) Version 2 candidate rendezvous point (RP) to the bootstrap router (BSR), use the ip pim rp-candidate command in global configuration mode. To remove this router as an RP candidate, use the no form of this command.

ip pim [vrf vrf-name] rp-candidate interface-type interface-number [group-list access-list] [bidir]

no ip pim [vrf vrf-name] rp-candidate

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

interface-type interface-number

IP address associated with this interface type and number is advertised as a candidate RP address.

group-list access-list

(Optional) Standard IP access list number or name that defines the group prefixes that are advertised in association with the RP address. The access list name cannot contain a space or quotation mark, and must begin with an alphabetic character to avoid confusion with numbered access lists.

bidir

(Optional) Indicates that the multicast groups specified by the access-list argument are to operate in bidirectional mode. If the command is configured without this option, the groups specified will operate in PIM sparse mode.


Defaults

Command is disabled.

Command Modes

Global configuration

Command History

Release
Modification

11.3 T

This command was introduced.

12.1(2)T

The bidir keyword was added.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

This command causes the router to send a PIM Version 2 message advertising itself as a candidate RP to the BSR. The addresses allowed by the access list, together with the router identified by the type and number, constitute the RP and its range of addresses for which it is responsible.

Use this command only in backbone routers that have good connectivity to all parts of the PIM domain. That is, a stub router that relies on an on-demand dialup link to connect to the rest of the PIM domain is not a good candidate RP.

Use this command with the bidir keyword when you want bidirectional forwarding and you are using the PIM Version 2 BSR mechanism to distribute group-to-RP mappings. Other options are as follows:

If you are using Auto-RP to distribute group-to-RP mappings, use the bidir keyword with the ip pim send-rp-announce command.

If you are not distributing group-to-RP mappings using either Auto-RP or the PIM Version 2 BSR mechanism, use the bidir keyword with the ip pim rp-address command.

Examples

The following example configures the router to advertise itself as a candidate RP to the BSR in its PIM domain. Standard access list number 4 specifies the group prefix associated with the RP that has the address identified by Ethernet interface 2. That RP is responsible for the groups with the prefix 239.

ip pim rp-candidate 192.168.37.33 ethernet 2 group-list 4
access-list 4 permit 239.0.0.0 0.255.255.255

Related Commands

Command
Description

ip pim bsr-candidate

Configures the router to announce its candidacy as a BSR.

ip pim rp-address

Configures the address of a PIM RP for a particular group.

ip pim rp-announce-filter

Filters incoming Auto-RP announcement messages coming from the RP.

ip pim send-rp-announce

Uses Auto-RP to configure for which groups the router is willing to act as RP.


ip pim send-rp-announce

To use Auto-RP to configure groups for which the router will act as a rendezvous point (RP), use the ip pim send-rp-announce command in global configuration mode. To deconfigure this router as an RP, use the no form of this command.

ip pim [vrf vrf-name] send-rp-announce interface-type interface-number scope ttl-value [group-list access-list] [interval seconds] [bidir]

no ip pim [vrf vrf-name] send-rp-announce

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

interface-type
interface-number

Interface type and number that is used to define the RP address.

scope ttl-value

Time-to-live (TTL) value that limits the number of Auto-RP announcements.

group-list access-list

(Optional) Standard IP access list number or name that defines the group prefixes that are advertised in association with the RP address. The access list name cannot contain a space or quotation mark, and must begin with an alphabetic character to avoid confusion with numbered access lists.

interval seconds

(Optional) Specifies the interval between RP announcements in seconds. The total holdtime of the RP announcements is automatically set to three times the value of the interval. The default interval is 60 seconds.

bidir

(Optional) Indicates that the multicast groups specified by the access-list argument are to operate in bidirectional mode. If the command is configured without this option, the groups specified will operate in Protocol Independent Multicast sparse mode (PIM-SM).


Defaults

Auto-RP is disabled.

Command Modes

Global configuration

Command History

Release
Modification

11.1

This command was introduced.

12.1(2)T

The following keywords and argument were added:

interval seconds

bidir

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

Use this command in the router you want to be an RP. When you are using Auto-RP to distribute group-to-RP mappings, this command causes the router to send an Auto-RP announcement message to the well-known group CISCO-RP-ANNOUNCE (224.0.1.39). This message announces the router as a candidate RP for the groups in the range described by the access list.

Use this command with the bidir keyword when you want bidirectional forwarding and you are using Auto-RP to distribute group-to-RP mappings. Other options are as follows:

If you are using the PIM Version 2 bootstrap router (PIMv2 BSR) mechanism to distribute group-to-RP mappings, use the bidir keyword with the ip pim rp-candidate command.

If you are not distributing group-to-RP mappings using either Auto-RP or the PIMv2 BSR mechanism, use the bidir keyword with the ip pim rp-address command.

Examples

The following example sends RP announcements out all Protocol Independent Multicast (PIM)-enabled interfaces for a maximum of 31 hops. The IP address by which the router wants to be identified as RP is the IP address associated with Ethernet interface 0. Access list 5 describes the groups for which this router serves as RP.

ip pim send-rp-announce ethernet0 scope 31 group-list 5
access-list 5 permit 224.0.0.0 15.255.255.255

Related Commands

Command
Description

access-list (IP standard)

Defines a standard IP access list.

ip pim rp-address

Configures the address of a PIM RP for a particular group.

ip pim rp-candidate

Configures the router to advertise itself as a PIM Version 2 candidate RP to the BSR.


ip pim send-rp-discovery

To configure the router to be an rendezvous point (RP) mapping agent, use the ip pim send-rp-discovery command in global configuration mode. To restore the default value, use the no form of this command.

ip pim [vrf vrf-name] send-rp-discovery [interface-type interface-number] scope ttl-value

no ip pim [vrf vrf-name] send-rp-discovery

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

interface-type interface-number

(Optional) Interface type and number that is used to define the RP mapping agent address.

scope ttl-value

Time-to-live (TTL) value in the IP header that keeps the discovery messages within this number of hops.


Defaults

The router is not an RP mapping agent.

Command Modes

Global configuration

Command History

Release
Modification

11.1

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

Configure this command on the router designated as an RP mapping agent. Specify a TTL large enough to cover your Protocol Independent Multicast (PIM) domain.

When Auto-RP is used, the following steps occur:

1. The RP mapping agent listens on well-known group address CISCO-RP-ANNOUNCE (224.0.1.39), which candidate RPs send to.

2. The RP mapping agent sends RP-to-group mappings in an Auto-RP RP discovery message to the well-known group CISCO-RP-DISCOVERY (224.0.1.40). The TTL value limits how many hops the message can take.

3. PIM designated routers listen to this group and use the RPs they learn about from the discovery message.

Examples

The following example limits Auto-RP RP discovery messages to 20 hops:

ip pim send-rp-discovery scope 20

ip pim spt-threshold

To configure when a Protocol Independent Multicast (PIM) leaf router should join the shortest path source tree for the specified group, use the ip pim spt-threshold command in global configuration mode. To restore the default value, use the no form of this command.

ip pim [vrf vrf-name] spt-threshold {kbps | infinity} [group-list access-list]

no ip pim [vrf vrf-name] spt-threshold

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

kbps

Traffic rate (in kbps).

infinity

Causes all sources for the specified group to use the shared tree.

group-list access-list

(Optional) Indicates which groups the threshold applies to. Must be an IP standard access list number or name. If the value is 0 or is omitted, the threshold applies to all groups.


Defaults

When this command is not used, the PIM leaf router joins the shortest path tree immediately after the first packet arrives from a new source.

Command Modes

Global configuration

Command History

Release
Modification

11.1

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

If a source sends at a rate greater than or equal to traffic rate (the kbps value), a PIM join message is triggered toward the source to construct a source tree.

If the infinity keyword is specified, all sources for the specified group will use the shared tree. Specifying a group list access list indicates the groups to which the threshold applies.

If the traffic rate from the source drops below the threshold traffic rate, the leaf router will, after some amount of time, switch back to the shared tree and send a prune message toward the source.

Examples

The following example sets a threshold of 4 kbps, above which traffic to a group from a source will cause the router to switch to the shortest path tree to that source:

ip pim spt-threshold 4

ip pim ssm

To define the Source Specific Multicast (SSM) range of IP multicast addresses, use the ip pim ssm command in global configuration mode. To disable the SSM range, use the no form of this command.

ip pim [vrf vrf-name] ssm {default | range access-list}

no ip pim [vrf vrf-name] ssm

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

default

Defines the SSM range access list to 232/8.

range access-list

Standard IP access list number or name defining the SSM range.


Defaults

Command is disabled.

Command Modes

Global configuration

Command History

Release
Modification

12.1(3)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

When an SSM range of IP multicast addresses is defined by the ip pim ssm command, no Multicast Source Discovery Protocol (MSDP) Source-Active (SA) messages will be accepted or originated in the SSM range.

Examples

The following example shows how to configure SSM service for the IP address range defined by access list 4:

access-list 4 permit 224.2.151.141
ip pim ssm range 4

Related Commands

Command
Description

ip igmp v3lite

Enables the acceptance and processing of IGMP v3lite membership reports on an interface.

ip urd

Enables interception of TCP packets sent to the reserved URD port 659 on an interface and processing of URD channel subscription reports.


ip pim state-refresh disable

To disable the processing and forwarding of PIM dense mode state refresh control messages on a Protocol Independent Multicast (PIM) router, use the ip pim state-refresh disable command in global configuration mode. To reenable the processing and forwarding of PIM dense mode state refresh control messages, use the no form of this command.

ip pim [vrf vrf-name] state-refresh disable

no ip pim [vrf vrf-name] state-refresh disable

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.


Defaults

The processing and forwarding of PIM dense mode state refresh control messages is enabled on PIM routers that are running a Cisco IOS software release that supports the PIM dense mode state refresh feature.

Command Modes

Global configuration

Command History

Release
Modification

12.1(5)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

Configuring this command removes PIM dense mode state refresh information from PIM hello messages.

Examples

The following example disables the periodic forwarding of the PIM dense mode state refresh control message down a source-based IP multicast distribution tree:

ip pim state-refresh disable

Related Commands

Command
Description

ip pim state-refresh origination-interval

Configures the origination of and the interval for the PIM dense mode state refresh control messages on a PIM router.

show ip pim interface

Displays information about interfaces configured for PIM.

show ip pim neighbor

Lists the PIM neighbors discovered by the Cisco IOS software.


mdt data

To configure the multicast group address range for data multicast distribution tree (MDT) groups, use the mdt data command in VRF configuration mode. To disable this function, use the no form of this command.

mdt data group-address-range wildcard-bits [threshold threshold-value] [list access-list]

no mdt data group-address-range wildcard-bits [threshold threshold-value] [list access-list]

Syntax Description

group-address-range

Multicast group address range. The range is from 224.0.0.1 to 239.255.255.255.

wildcard-bits

Wildcard bits to be applied to the Multicast group address range.

threshold threshold-value

(Optional) Defines the bandwidth threshold value. The range is from 1 through 4294967.

list access-list

(Optional) Defines the access list name or number.


Defaults

Disabled

Command Modes

VRF configuration

Command History

Release
Modification

12.0(23)S

This command was introduced.


Usage Guidelines

A data MDT group can include a maximum of 256 multicast groups per VPN. Multicast groups used to create the data MDT group are dynamically chosen from a pool of configured IP addresses.

This command configures a range of alternative multicast destination addresses for the tunnel header. The destination address chosen depends on the traffic profile (that is, the source and destination match the specified access list and the rate of the traffic has exceeded the bandwidth threshhold value).

Examples

In the following example, Protocol Independent Multicast (PIM) source-specific mode (SSM) is configured in the backbone. Therefore, the default and data MDT groups are configured within the SSM range of IP addresses. Inside the VPN, PIM sparse mode (PIM-SM) is configured and only the Auto-RP announcements are accepted.

ip vrf red
 rd 1:1
 route-target export 1:1
 route-target import 1:1
 mdt default 232.0.0.1
 mdt data 232.0.1.0 0.0.0.255 threshold 500 list 101
!
ip pim ssm default
ip pim vrf red accept-rp auto-rp

Related Commands

Command
Description

mdt default

Configures a default MDT group for a VPN VRF.


mdt default

To configure a default multicast distribution tree (MDT) group for a Virtual Private Network (VPN) routing and forwarding (VRF) instance, use the mdt default command in VRF configuration mode. To disable this function, use the no form of this command.

mdt default group-address

no mdt default group-address

Syntax Description

group-address

IP address of the default MDT group. This address serves as an identifier for the community in that provider-edge (PE) routers configured with the same group address become members of the group, allowing them to receive packets sent by each other.


Defaults

Disabled

Command Modes

VRF configuration

Command History

Release
Modification

12.0(23)S

This command was introduced.


Usage Guidelines

The default MDT group must be the same group configured on all PE routers that belong to the same VPN.

If Source Specific Multicast (SSM) is used as the protocol for the default MDT, the source IP address will be the address used to source the Border Gateway Protocol (BGP) sessions.

A tunnel interface is created as a result of this command. By default, the destination address of the tunnel header is the group-address argument.

Examples

In the following example, Protocol Independent Multicast (PIM) source-specific mode (SSM) is configured in the backbone. Therefore, the default and data MDT groups are configured within the SSM range of IP addresses. Inside the VPN, PIM sparse mode (PIM-SM) is configured and only the Auto-RP announcements are accepted.

ip vrf red
 rd 1:1
 route-target export 1:1
 route-target import 1:1
 mdt default 232.0.0.1
 mdt data 232.0.1.0 0.0.0.255 threshold 500 list 101
!
ip pim ssm default
ip pim vrf red accept-rp auto-rp

Related Commands

Command
Description

mdt data

Configures the multicast group address range for data MDT groups.


mdt log-reuse

To enable the recording of data MDT reuse, use the mdt log-reuse command in VRF configuration mode. To disable this function, use the no form of this command.

mdt log-reuse

no mdt log-reuse

Syntax Description

This command has no arguments or keywords.

Defaults

Disabled

Command Modes

VRF configuration

Command History

Release
Modification

12.0(23)S

This command was introduced.


Usage Guidelines

The mdt log-reuse command generates a syslog message whenever a data MDT is reused.

Examples

In the following example, the MDT log reuse function is enabled.

mdt log-resue

Related Commands

Command
Description

mdt data

Configures the multicast group address range for data MDT groups.

mdt default

Configures a default MDT group for a VPN VRF.


show ip igmp groups

To display the multicast groups with receivers that are directly connected to the router and that were learned through Internet Group Management Protocol (IGMP), use the show ip igmp groups command in EXEC mode.

show ip igmp [vrf vrf-name] groups [group-name | group-address | interface-type interface-number] [detail]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

group-name

(Optional) Name of the multicast group, as defined in the Domain Name System (DNS) hosts table.

group-address

(Optional) Address of the multicast group. This is a multicast IP address in four-part, dotted-decimal notation.

interface-type

(Optional) Interface type.

interface-number

(Optional) Interface number.

detail

(Optional) Provides a detailed description of the sources known through IGMP Version 3 (IGMPv3), IGMP v3lite, or URL Rendezvous Directory (URD).


Command Modes

EXEC

Command History

Release
Modification

10.0

This command was introduced.

12.1(3)T

Fields were added to the output of this command to support the Source Specific Multicast (SSM) feature.

12.1(5)T

The detail keyword was added.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

If you omit all optional arguments and keywords, the show ip igmp groups command displays by group address, interface type, and interface number all directly connected multicast groups.

Examples

The following is sample output from the show ip igmp groups command:

Router# show ip igmp groups

IGMP Connected Group Membership
Group Address     Interface         Uptime      Expires     Last Reporter
239.255.255.254   Ethernet3/1       1w0d        00:02:19    172.21.200.159
224.0.1.40        Ethernet3/1       1w0d        00:02:15    172.21.200.1
224.0.1.40        Ethernet3/3       1w0d        never       172.16.214.251
224.0.1.1         Ethernet3/1       1w0d        00:02:11    172.21.200.11
224.9.9.2         Ethernet3/1       1w0d        00:02:10    172.21.200.155
232.1.1.1         Ethernet3/1       5d21h       stopped     172.21.200.206

The following is sample output from the show ip igmp groups command with the group-address argument and detail keyword:

Router# show ip igmp groups 232.1.1.1 detail

Interface:      Ethernet3/2
Group:          232.1.1.1
Uptime:         01:58:28
Group mode:     INCLUDE
Last reporter:  10.0.119.133
CSR Grp Exp:    00:02:38
Group source list: (C - Cisco Src Report, U - URD, R - Remote)
  Source Address   Uptime    v3 Exp    CSR Exp   Fwd  Flags
  172.16.214.1     01:58:28  stopped   00:02:31  Yes  C

Table 4 describes the significant fields shown in the displays.

Table 4 show ip igmp groups Field Descriptions 

Field
Description

Group Address

Address of the multicast group.

Interface

Interface through which the group is reachable.

Uptime

How long (in weeks, days, hours, minutes, and seconds) this multicast group has been known.

Expires

How long (in hours, minutes, and seconds) until the entry expires. If an entry expires, then the entry will (for a short period) show the word "now" before it is removed.

The word "never" indicates that the entry will not time out, because a local receiver is on this router for this entry.

The word "stopped" indicates that timing out of this entry is not determined by this expire timer. If the router is in INCLUDE mode for a group, then the whole group entry will time out after the last source entry has timed out (unless the mode is changed to EXCLUDE mode before it times out).

Last Reporter

Last host to report being a member of the multicast group. Both IGMP v3lite and URD require a v2-report.

Group mode:

Can be either INCLUDE or EXCLUDE. The group mode is based on the type of membership reports received on the interface for the group. In the output for the show ip igmp groups detail command, the EXCLUDE mode also shows the "Expires:" field for the group entry (not shown in the output).

CSR Grp Exp

This field is shown for multicast groups in the Source Specific Multicast (SSM) range. It indicates the time (in hours, minutes, and seconds) since the last received group membership report was received. Cisco IOS software needs to use these reports for the operation of URD and IGMP v3lite, but they do not indicate group membership by themselves.

Group source list:

Provides details of which sources have been requested by the multicast group.

Source Address

IP address of the source.

Uptime

Indicates the time since the source state was created.

v3 Exp

Indicates the time (in hours, minutes, and seconds) until the membership for the source will time out according to IGMP operations. The word "stopped" is shown if no member uses IGMPv3 (but only IGMP v3lite or URD).

CSR Exp

Indicates the time (in hours, minutes, and seconds) until the membership for the source will time out according to IGMP v3lite or URD reports. The word "stopped" is shown if members use only IGMPv3.

Fwd

Indicates whether the router is forwarding multicast traffic due to this entry.

Flags

Information about the entry. The Remote flag indicates that an IGMPv3 report has been received by this source. The C flag indicates that an IGMP v3lite or URD report was received by this source. The U flag indicates that a URD report was received for this source.


Related Commands

Command
Description

ip igmp query-interval

Configures the frequency at which the Cisco IOS software sends IGMP host query messages.


show ip igmp interface

To display multicast-related information about an interface, use the show ip igmp interface command in EXEC mode.

show ip igmp [vrf vrf-name] interface [type number]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

type

(Optional) Interface type.

number

(Optional) Interface number.


Command Modes

EXEC

Command History

Release
Modification

10.0

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

If you omit the optional arguments, the show ip igmp interface command displays information about all interfaces.

This command also displays information about dynamically learned Distance Vector Multicast Routing Protocol (DVMRP) routers on the interface.

Examples

The following is sample output from the show ip igmp interface command:

Router# show ip igmp interface

Ethernet0 is up, line protocol is up
  Internet address is 192.168.37.6, subnet mask is 255.255.255.0
  IGMP is enabled on interface
  IGMP query interval is 60 seconds
  Inbound IGMP access group is not set
  Multicast routing is enabled on interface
  Multicast TTL threshold is 0
  Multicast designated router (DR) is 192.168.37.33
  No multicast groups joined
Ethernet1 is up, line protocol is up
  Internet address is 192.168.36.129, subnet mask is 255.255.255.0
  IGMP is enabled on interface
  IGMP query interval is 60 seconds
  Inbound IGMP access group is not set
  Multicast routing is enabled on interface
  Multicast TTL threshold is 0
  Multicast designated router (DR) is 192.168.36.131
  Multicast groups joined: 225.2.2.2 226.2.2.2
Tunnel0 is up, line protocol is up
  Internet address is 10.1.37.2, subnet mask is 255.255.0.0
  IGMP is enabled on interface
  IGMP query interval is 60 seconds
  Inbound IGMP access group is not set
  Multicast routing is enabled on interface
  Multicast TTL threshold is 0
  No multicast groups joined

Table 5 describes the significant fields shown in the display.

Table 5 show ip igmp interface Field Descriptions 

Field
Description

Ethernet0 is up, line protocol is up

Interface type, number, and status.

Internet address is..., subnet mask is...

Internet address of the interface and subnet mask being applied to the interface, as specified with the ip address command.

IGMP is enabled on interface

Indicates whether IGMP has been enabled on the interface with the ip pim command.

IGMP query interval is 60 seconds

Interval at which the Cisco IOS software sends Protocol Independent Multicast (PIM) router query messages, as specified with the ip igmp query-interval command.

Inbound IGMP access group is not set

Indicates whether an IGMP access group has been configured with the ip igmp access-group command.

Multicast routing is enabled on interface

Indicates whether multicast routing has been enabled on the interface with the ip pim command.

Multicast TTL threshold is 0

Packet time-to-threshold, as specified with the ip multicast ttl-threshold command.

Multicast designated router (DR) is...

IP address of the designated router for this LAN segment (subnet).

No multicast groups joined

Indicates whether this interface is a member of any multicast groups and, if so, lists the IP addresses of the groups.


Related Commands

Command
Description

ip address

Sets a primary or secondary IP address for an interface.

ip igmp access-group

Controls the multicast groups that hosts on the subnet serviced by an interface can join.

ip igmp query-interval

Configures the frequency at which the Cisco IOS software sends IGMP host query messages.

ip multicast ttl-threshold

Configures the TTL threshold of packets being forwarded out an interface.

ip pim

Enables PIM on an interface.


show ip mcache

To display the contents of the IP fast-switching cache, use the show ip mcache command in EXEC mode.

show ip mcache [vrf vrf-name] [group-address | group-name] [source-address | source-name]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

group-address | group-name

(Optional) Displays the fast-switching cache for the single group. Can be either a Class D IP address or a Domain Name System (DNS) name.

source-address | source-name

(Optional) If the source address or name is also specified, displays a single multicast cache entry. Can be either a unicast IP address or a DNS name.


Command Modes

EXEC

Command History

Release
Modification

11.0

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Examples

The following is sample output from the show ip mcache command. This entry shows a specific source (wrn-source 226.62.246.73) sending to the World Radio Network group (224.2.143.24).

Router> show ip mcache wrn wrn-source

IP Multicast Fast-Switching Cache 
(226.62.246.73/32, 224.2.143.24), Fddi0, Last used: 00:00:00  
  Ethernet0       MAC Header: 01005E028F1800000C1883D30800 
  Ethernet1       MAC Header: 01005E028F1800000C1883D60800 
  Ethernet2       MAC Header: 01005E028F1800000C1883D40800 
  Ethernet3       MAC Header: 01005E028F1800000C1883D70800

Table 6 describes the significant fields shown in the display.

Table 6 show ip mcache Field Descriptions 

Field
Description

226.62.246.73

Source address.

224.2.143.24

Destination address.

Fddi0

Incoming or expected interface on which the packet should be received.

Last used:

Latest time the entry was accessed for a packet that was successfully fast switched. The word "Semi-fast" indicates that the first part of the outgoing interface list is fast switched and the rest of the list is process level switched.

Ethernet0

MAC Header:

Outgoing interface list and respective MAC header that is used when rewriting the packet for output. If the interface is a tunnel, the MAC header will show the real next hop MAC header and then, in parentheses, the real interface name.


show ip mds interface

To display Multicast Distributed Switching (MDS) information for all the interfaces on the line card, use the show ip mds interface command in EXEC mode.

show ip mds interface [vrf vrf-name]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.


Command Modes

EXEC

Command History

Release
Modification

11.0

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Examples

The following is sample output from the show ip mds interface command.

Router# show ip mds interface

Interface                SW-Index  HW-Index  HW IDB      FS Vector   VRF
Ethernet1/0/0            2         1         0x60C2DB40  0x602FB7A4 default
Ethernet1/0/1            3         2         0x60C32280  0x603D52B8 default
Ethernet1/0/2            4         3         0x60C35E40  0x602FB7A4 default
Ethernet1/0/3            5         4         0x60C39E60  0x603D52B8 default
Ethernet1/0/4            6         5         0x60C3D780  0x602FB7A4 default
Ethernet1/0/5            7         6         0x60C41140  0x602FB7A4 default
Ethernet1/0/6            8         7         0x60C453A0  0x602FB7A4 default
Ethernet1/0/7            9         8         0x60C48DC0  0x602FB7A4 default
POS2/0/0                 10        9         0x0                    default
POS3/0/0                 11        10        0x0                    default
Virtual-Access1          13        11        0x0                    default
Loopback0                14        12        0x0                    default
Tunnel0                  15        23        0x61C2E480  0x603D52B8  vrf1
Tunnel1                  16        24        0x61C267E0  0x603D52B8  vrf2
Ethernet1/0/3.1          17        4         0x60C39E60  0x603D52B8  vrf1
Ethernet1/0/3.2          18        4         0x60C39E60  0x603D52B8  vrf2

Table 7 describes the significant fields shown in the display.

Table 7 show ip mds interface Field Descriptions 

Field
Description

Interface

The specified interface.

SW-Index

Software index.

HW-Index

Hardware index.

HW IDB

Hardware interface description block.

VRF

VPN routing/forwarding instance.


show ip mpacket

To display the contents of the circular cache-header buffer, use the show ip mpacket command in EXEC mode.

show ip mpacket [vrf vrf-name] [group-address | group-name] [source-address | source-name] [detail]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

group-address | group-name

(Optional) Displays cache headers matching the specified group address or group name.

source-address | source-name

(Optional) Displays cache headers matching the specified source address or source name.

detail

(Optional) In addition to the summary information, displays the rest of the IP header fields on an additional line, plus the first 8 bytes after the IP header (usually the User Datagram Protocol [UDP] port numbers).


Command Modes

EXEC

Command History

Release
Modification

11.1

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

This command is applicable only when the ip multicast cache-headers command is in effect.

Each time this command is entered, a new buffer is allocated. The summary display (when the detail keyword is omitted) shows the IP packet identifier, time-to-live (TTL) value, source and destination IP addresses, and a local time stamp when the packet was received.

The two arguments and one keyword can be used in the same command in any combination.

Examples

The following is sample output from the show ip mpacket command with the group-name argument:

Router # show ip mpacket smallgroup

IP Multicast Header Cache - entry count:6, next index: 7
Key: id/ttl timestamp (name) source group

D782/117 206416.908 (ABC-xy.company.com) 192.168.228.10 224.5.6.7
7302/113 206417.908 (school.edu) 147.12.2.17 224.5.6.7
6CB2/114 206417.412 (MSSRS.company.com) 154.2.19.40 224.5.6.7
D782/117 206417.868 (ABC-xy.company.com) 192.168.228.10 224.5.6.7
E2E9/123 206418.488 (Newman.com) 211.1.8.10 224.5.6.7
1CA7/127 206418.544 (teller.company.com) 192.168.6.10 224.5.6.7


Table 8 describes the significant fields shown in the display.

Table 8 show ip mpacket Field Descriptions 

Field
Description

entry count

Number of packets cached (one packet for each line in the display). The cache has lines numbered from 0 to 1024.

next index

The index for the next element in the cache.

id

Identification number of the IP packet.

ttl

Current TTL of the packet.

timestamp

Time-stamp sequence number of the packet.

(name)

Domain Name System (DNS) name of the source sending to the group. Name appears in parentheses.

source

IP address of the source sending to the group.

group

Multicast group address to which the packet is sent. In this example, the group address is the group name smallgroup.


Related Commands

Command
Description

ip multicast cache-headers

Allocates a circular buffer to store IP multicast packet headers that the router receives.


show ip mroute

To display the contents of the IP multicast routing table, use the show ip mroute command in EXEC mode.

show ip mroute [vrf vrf-name] [group-address | group-name] [source-address | source-name] [interface-type interface-number] [summary] [count] [active kbps]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

group-address | group-name

(Optional) IP address or name multicast group as defined in the Domain Name System (DNS) hosts table.

source-address | source-name

(Optional) IP address or name of a multicast source.

interface-type interface-number

(Optional) Interface type and number.

summary

(Optional) Displays a one-line, abbreviated summary of each entry in the IP multicast routing table.

count

(Optional) Displays statistics about the group and source, including number of packets, packets per second, average packet size, and bytes per second.

active kbps

(Optional) Displays the rate that active sources are sending to multicast groups. Active sources are those sending at the kbps value or higher. The kbps argument defaults to 4 kbps.


Defaults

The show ip mroute command displays all groups and sources.

The show ip mroute active command displays all sources sending at a rate greater than or equal to 4 kbps.

Command Modes

EXEC

Command History

Release
Modification

10.0

This command was introduced.

12.1(3)T

The U, s, and I flags for Source Specific Multicast (SSM) were introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

If you omit all optional arguments and keywords, the show ip mroute command displays all entries in the IP multicast routing table.

The Cisco IOS software populates the multicast routing table by creating (S, G) entries from (*, G) entries. The asterisk (*) refers to all source addresses, the "S" refers to a single source address, and the "G" is the destination multicast group address. In creating (S, G) entries, the software uses the best path to that destination group found in the unicast routing table (that is, through Reverse Path Forwarding [RPF]).

Examples

The following is sample output from the show ip mroute command for a router operating in dense mode. This output displays the contents of the IP multicast routing table for the multicast group named cbone-audio.

Router# show ip mroute cbone-audio

IP Multicast Routing Table
Flags: D - Dense, S - Sparse, C - Connected, L - Local, P - Pruned
       R - RP-bit set, F - Register flag, T - SPT-bit set
Timers: Uptime/Expires
Interface state: Interface, Next-Hop, State/Mode

(*, 224.0.255.1), uptime 0:57:31, expires 0:02:59, RP is 224.0.0.0, flags: DC
  Incoming interface: Null, RPF neighbor 224.0.0.0, Dvmrp
  Outgoing interface list:
    Ethernet0, Forward/Dense, 0:57:31/0:02:52
    Tunnel0, Forward/Dense, 0:56:55/0:01:28

(192.168.37.100/32, 224.0.255.1), uptime 20:20:00, expires 0:02:55, flags: C
  Incoming interface: Tunnel0, RPF neighbor 10.20.37.33, Dvmrp
  Outgoing interface list:
    Ethernet0, Forward/Dense, 20:20:00/0:02:52

The following is sample output from the show ip mroute command for a router operating in sparse mode:

Router# show ip mroute

IP Multicast Routing Table
Flags: D - Dense, S - Sparse, C - Connected, L - Local, P - Pruned
       R - RP-bit set, F - Register flag, T - SPT-bit set
Timers: Uptime/Expires
Interface state: Interface, Next-Hop, State/Mode

(*, 224.0.255.3), uptime 5:29:15, RP is 192.168.37.2, flags: SC
  Incoming interface: Tunnel0, RPF neighbor 10.3.35.1, Dvmrp
  Outgoing interface list:
    Ethernet0, Forward/Sparse, 5:29:15/0:02:57

(192.168.46.0/24, 224.0.255.3), uptime 5:29:15, expires 0:02:59, flags: C
  Incoming interface: Tunnel0, RPF neighbor 10.3.35.1
  Outgoing interface list:
    Ethernet0, Forward/Sparse, 5:29:15/0:02:57

The following is sample output from the show ip mroute command that shows the virtual circuit descriptor (VCD) value, because an ATM interface with Protocol Independent Multicast (PIM) multipoint signaling is enabled:

Router# show ip mroute 224.1.1.1

IP Multicast Routing Table
Flags: D - Dense, S - Sparse, C - Connected, L - Local, P - Pruned
       R - RP-bit set, F - Register flag, T - SPT-bit set, J - Join SPT
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 224.1.1.1), 00:03:57/00:02:54, RP 130.4.101.1, flags: SJ
  Incoming interface: Null, RPF nbr 224.0.0.0224.0.0.0
  Outgoing interface list:
    ATM0/0, VCD 14, Forward/Sparse, 00:03:57/00:02:53

The following is sample output from the show ip mroute command with the summary keyword:

Router# show ip mroute summary

IP Multicast Routing Table
Flags: D - Dense, S - Sparse, C - Connected, L - Local, P - Pruned
       R - RP-bit set, F - Register flag, T - SPT-bit set, J - Join SPT
Timers: Uptime/Expires
Interface state: Interface, Next-Hop, State/Mode

(*, 224.255.255.255), 2d16h/00:02:30, RP 172.16.10.13, flags: SJPC

(*, 224.2.127.253), 00:58:18/00:02:00, RP 172.16.10.13, flags: SJC

(*, 224.1.127.255), 00:58:21/00:02:03, RP 172.16.10.13, flags: SJC

(*, 224.2.127.254), 2d16h/00:00:00, RP 172.16.10.13, flags: SJCL
  (172.16.160.67/32, 224.2.127.254), 00:02:46/00:00:12, flags: CLJT
  (172.16.244.217/32, 224.2.127.254), 00:02:15/00:00:40, flags: CLJT
  (172.16.8.33/32, 224.2.127.254), 00:00:25/00:02:32, flags: CLJT
  (172.16.2.62/32, 224.2.127.254), 00:00:51/00:02:03, flags: CLJT
  (172.16.8.3/32, 224.2.127.254), 00:00:26/00:02:33, flags: CLJT
  (172.16.60.189/32, 224.2.127.254), 00:03:47/00:00:46, flags: CLJT

The following is sample output from the show ip mroute command with the active keyword:

Router# show ip mroute active

Active IP Multicast Sources - sending >= 4 kbps

Group: 224.2.127.254, (sdr.cisco.com)
   Source: 192.168.28.69 (mbone.ipd.anl.gov)
     Rate: 1 pps/4 kbps(1sec), 4 kbps(last 1 secs), 4 kbps(life avg)

Group: 224.2.201.241, ACM 97
   Source: 192.168.52.160 (webcast3-e1.acm97.interop.net)
     Rate: 9 pps/93 kbps(1sec), 145 kbps(last 20 secs), 85 kbps(life avg)

Group: 224.2.207.215, ACM 97
   Source: 192.168.52.160 (webcast3-e1.acm97.interop.net)
     Rate: 3 pps/31 kbps(1sec), 63 kbps(last 19 secs), 65 kbps(life avg)

The following is sample output from the show ip mroute command with the count keyword:

Router# show ip mroute count

IP Multicast Statistics - Group count: 8, Average sources per group: 9.87
Counts: Pkt Count/Pkts per second/Avg Pkt Size/Kilobits per second

Group: 224.255.255.255, Source count: 0, Group pkt count: 0
  RP-tree: 0/0/0/0

Group: 224.2.127.253, Source count: 0, Group pkt count: 0
  RP-tree: 0/0/0/0

Group: 224.1.127.255, Source count: 0, Group pkt count: 0
  RP-tree: 0/0/0/0

Group: 224.2.127.254, Source count: 9, Group pkt count: 14
  RP-tree: 0/0/0/0
  Source: 172.16.6.9/32, 2/0/796/0
  Source: 172.16.131.87/32, 1/0/616/0
  Source: 172.16.51.58/32, 1/0/412/0
  Source: 172.16.8.33/32, 1/0/936/0
  Source: 172.16.2.62/32, 1/0/750/0
  Source: 172.16.8.3/32, 1/0/660/0
  Source: 192.168.28.69/32, 1/0/584/0
  Source: 172.16.60.189/32, 4/0/447/0
  Source: 192.162.119.8/32, 2/0/834/0

Group: 224.0.1.40, Source count: 1, Group pkt count: 3606
  RP-tree: 0/0/0/0
  Source: 172.16.214.50/32, 3606/0/48/0, RPF Failed: 1203

Group: 224.2.201.241, Source count: 36, Group pkt count: 54152
  RP-tree: 7/0/108/0
  Source: 10.242.36.83/32, 99/0/123/0
  Source: 10.29.1.3/32, 71/0/110/0
  Source: 172.17.160.96/32, 505/1/106/0
  Source: 172.17.163.170/32, 661/1/88/0
  Source: 172.17.31.26/32, 192/0/118/0
  Source: 172.17.111.45/32, 500/0/87/0
  Source: 172.17.33.134/32, 248/0/119/0
  Source: 172.17.7.62/32, 527/0/118/0
  Source: 172.17.32.25/32, 554/0/105/0
  Source: 172.17.32.151/32, 551/1/125/0
  Source: 172.17.156.117/32, 535/1/114/0
  Source: 172.17.225.21/32, 582/0/114/0
  Source: 172.17.142.50/32, 78/0/127/0
  Source: 172.17.50.14/32, 526/0/118/0
  Source: 172.18.0.13/32, 522/0/95/0
  Source: 172.18.52.160/32, 40839/16/920/161
  Source: 172.18.52.161/32, 476/0/97/0
  Source: 172.18.224.10/32, 456/0/113/0
  Source: 172.18.32.108/32, 9/1/112/0

The following is sample output from the show ip mroute command for a router supporting SSM 
services:

Router# show ip mroute 232.6.6.6

IP Multicast Routing Table
Flags:D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C -
Connected, L - Local, P - Pruned, R - RP-bit set, F - Register flag, T - SPT-bit set, J - 
Join SPT, M - MSDP created entry, X - Proxy Join Timer Running, A - Advertised via MSDP, U 
- URD, I - Received Source Specific Host Report
Outgoing interface flags:H - Hardware switched
Timers:Uptime/Expires
Interface state:Interface, Next-Hop or VCD, State/Mode
 
(*, 232.6.6.6), 00:01:20/00:02:59, RP 224.0.0.0, flags:sSJP
  Incoming interface:Null, RPF nbr 224.0.0.0
  Outgoing interface list:Null
 
(10.2.2.2, 232.6.6.6), 00:01:20/00:02:59, flags:CTI
  Incoming interface:Ethernet3/3, RPF nbr 224.0.0.0
  Outgoing interface list:
    Ethernet3/1, Forward/Sparse-Dense, 00:00:36/00:02:35

Table 9 describes the significant fields shown in the display.

Table 9 show ip mroute Field Descriptions 

Field
Description

Flags:

Provides information about the entry.

D - Dense

Entry is operating in dense mode.

S - Sparse

Entry is operating in sparse mode.

B - Bidir Group

Indicates that a multicast group is operating in bidirectional mode.

s - SSM Group

Indicates that a multicast group is within the SSM range of IP addresses. This flag is reset if the SSM range changes.

C - Connected

A member of the multicast group is present on the directly connected interface.

L - Local

The router itself is a member of the multicast group. Groups are joined locally by the ip igmp join-group command (for the configured group), the ip sap listen command (for the well-known session directory groups), and rendezvous point (RP) mapping (for the well-known groups 224.0.1.39 and 224.0.1.40). Locally joined groups are not fast switched.

P - Pruned

Route has been pruned. The Cisco IOS software keeps this information so that a downstream member can join the source.

R - RP-bit set

Indicates that the (S, G) entry is pointing toward the RP. This is typically prune state along the shared tree for a particular source.

F - Register flag

Indicates that the software is registering for a multicast source.

T - SPT-bit set

Indicates that packets have been received on the shortest path source tree.

J - Join SPT

For (*, G) entries, indicates that the rate of traffic flowing down the shared tree is exceeding the SPT-Threshold set for the group. (The default SPT-Threshold setting is 0 kbps.) When the J - Join shortest path tree (SPT) flag is set, the next (S, G) packet received down the shared tree triggers an (S, G) join in the direction of the source, thereby causing the router to join the source tree.

For (S, G) entries, indicates that the entry was created because the SPT-Threshold for the group was exceeded. When the J - Join SPT flag is set for (S, G) entries, the router monitors the traffic rate on the source tree and attempts to switch back to the shared tree for this source if the traffic rate on the source tree falls below the SPT-Threshold of the group for more than 1 minute.

Note The router measures the traffic rate on the shared tree and compares the measured rate to the SPT-Threshold of the group once every second. If the traffic rate exceeds the SPT-Threshold, the J - Join SPT flag is set on the (*, G) entry until the next measurement of the traffic rate. The flag is cleared when the next packet arrives on the shared tree and a new measurement interval is started.

If the default SPT-Threshold value of 0 kbps is used for the group, the J - Join SPT flag is always set on (*, G) entries and is never cleared. When the default SPT-Threshold value is used, the router immediately switches to the shortest path source tree when traffic from a new source is received.

M - MSDP created entry

Indicates that a (*, G) entry was learned through a Multicast Source Discovery Protocol (MSDP) peer. This flag is applicable only for an RP running MSDP.

X - Proxy Join Timer Running

Indicates that the proxy join timer is running. This flag is set only for (S, G) entries of an RP or "turnaround" router. A "turnaround" router is located at the intersection of a shared path (*, G) tree and the shortest path from the source to the RP.

A - Advertised via MSDP

Indicates that an (S, G) entry was advertised through an MSDP peer. This flag is applicable only for an RP running MSDP.

U - URD

Indicates that a URL Rendezvous Directory (URD) channel subscription report was received for the (S, G) entry.

I - Received Source Specific Host Report

Indicates that an (S, G) entry was created by an (S, G) report. This (S, G) report could have been created by Internet Group Management Protocol Version 3 (IGMPv3), URD, or IGMP v3lite. This flag is set only on the designated router (DR).

Outgoing interface flags:

Provides information about the entry.

H - Hardware switched

Indicates that a Multicast Multilayer Switching (MMLS) forwarding path has been established for this entry.

Timers:Uptime/Expires

"Uptime" indicates per interface how long (in hours, minutes, and seconds) the entry has been in the IP multicast routing table. "Expires" indicates per interface how long (in hours, minutes, and seconds) until the entry will be removed from the IP multicast routing table.

Interface state:

Indicates the state of the incoming or outgoing interface.

Interface

Indicates the type and number of the interface listed in the incoming or outgoing interface list.

Next-Hop or VCD

"Next-hop" specifies the IP address of the downstream neighbor. "VCD" specifies the virtual circuit descriptor number. "VCD0" means the group is using the static map virtual circuit.

State/Mode

"State" indicates that packets will either be forwarded, pruned, or null on the interface depending on whether there are restrictions due to access lists or a time to live (TTL) threshold. "Mode" indicates whether the interface is operating in dense, sparse, or sparse-dense mode.

(*, 224.0.255.1) and (192.168.37.100/32, 224.0.255.1)

Entry in the IP multicast routing table. The entry consists of the IP address of the source router followed by the IP address of the multicast group. An asterisk (*) in place of the source router indicates all sources.

Entries in the first format are referred to as (*, G) or "star comma G" entries. Entries in the second format are referred to as (S, G) or "S comma G" entries. (*, G) entries are used to build (S, G) entries.

RP

Address of the RP router. For routers and access servers operating in sparse mode, this address is always 224.0.0.0.

flags:

Information about the entry.

Incoming interface:

Expected interface for a multicast packet from the source. If the packet is not received on this interface, it is discarded.

RPF neighbor or RPF nbr

IP address of the upstream router to the source. Tunneling indicates that this router is sending data to the RP encapsulated in register packets. The hexadecimal number in parentheses indicates to which RP it is registering. Each bit indicates a different RP if multiple RPs per group are used.

Outgoing interface list:

Interfaces through which packets will be forwarded. When the ip pim nbma-mode command is enabled on the interface, the IP address of the Protocol Independent Multicast (PIM) neighbor is also displayed.


Related Commands

Command
Description

ip multicast-routing

Enables IP multicast routing or multicast distributed switching.

ip pim

Enables PIM on an interface.

ip pim ssm

Defines the SSM range of IP multicast addresses.


show ip msdp count

To display the number of sources and groups originated in Multicast Source Discovery Protocol (MSDP) Source-Active (SA) messages and the number of SA messages from an MSDP peer in the SA cache, use the show ip msdp count command in EXEC mode.

show ip msdp [vrf vrf-name] count [as-number]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

as-number

(Optional) Displays the number of sources and groups originated in SA messages from the specified autonomous system number.


Command Modes

EXEC

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.1(7)

This command was modified to display information about the number of SA messages from each MSDP peer in the SA cache.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

The ip msdp cache-sa-state command must be configured for this command to have any output.

Examples

The following is sample output from the show ip msdp count command:

Router# show ip msdp count

SA State per Peer Counters, <Peer>: <# SA learned>
 224.135.250.116: 24
 172.16.240.253: 3964
 172.16.253.19: 10
 172.16.170.110: 11

SA State per ASN Counters, <asn>: <# sources>/<# groups>
 Total entries: 4009
 ?: 192/98, 9: 1/1, 14: 107/57, 17: 7/5
 18: 4/3, 25: 23/17, 26: 39/27, 27: 2/2
 32: 19/7, 38: 2/1, 52: 4/4, 57: 1/1
 68: 4/4, 73: 12/8, 81: 19/1, 87: 9/6
 .
 .
 .

Table 10 describes the significant fields shown in the display.

Table 10 show ip msdp count Field Descriptions 

Field
Description

224.135.250.116: 24

MSDP peer with IP address 224.135.250.116: 24 SA messages from the MSDP peer in the SA cache.

Total entries

Total number of SA entries in the SA cache.

9: 1/1

Autonomous system 9: 1 source/1 group.


Related Commands

Command
Description

ip msdp cache-sa-state

Enables the router to create SA state.


show ip msdp peer

To display detailed information about the Multicast Source Discovery Protocol (MSDP) peer, use the show ip msdp peer command in EXEC mode.

show ip msdp [vrf vrf-name] peer [peer-address | peer-name]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

peer-address | peer-name

(Optional) Domain Name System (DNS) name or IP address of the MSDP peer for which information is displayed.


Command Modes

EXEC

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.1(7)

This command was modified to display information about the source address (SA) message limit configured using the the ip msdp sa-limit command.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Examples

The following is sample output of the show ip msdp peer command:

Router# show ip msdp peer 224.135.250.116

MSDP Peer 224.135.250.116 (rtp5-rp1.cisco.com), AS 109 (configured AS)
Description:
 Connection status:
   State: Up, Resets: 9, Connection source: Loopback2 (228.69.199.17)
   Uptime(Downtime): 1d10h, Messages sent/received: 436765/429062
   Output messages discarded: 0
   Connection and counters cleared 1w2d     ago
 SA Filtering:
   Input (S,G) filter: none, route-map: none
   Input RP filter: none, route-map: none
   Output (S,G) filter: none, route-map: none
   Output RP filter: none, route-map: none
 SA-Requests:
   Input filter: none
   Sending SA-Requests to peer: disabled
 Peer ttl threshold: 0
 SAs learned from this peer: 32, SAs limit: 500
 Input queue size: 0, Output queue size: 0

Table 11 describes the significant fields shown in the display.

Table 11 show ip msdp peer Field Descriptions 

Field
Description

MSDP Peer

IP address of the MSDP peer.

AS

Autonomous system to which the MSDP peer belongs.

State:

State of the MSDP peer.

Connection source:

Interface used to obtain the IP address for the TCP local connection address.

Uptime(Downtime):

Days and hours the MSDP peer is up or down. If the time is less than 24 hours, it is shown in terms of hours:minutes:seconds.

Messages sent/received:

Number of SA messages sent to the MSDP peer/number of SA messages received from the MSDP peer.

SA Filtering:

Information regarding access list filtering of SA input and output, if any.

SA-Requests:

Information regarding access list filtering of SA requests, if any.

SAs learned from this peer:

Number of SA messages from the MSDP peer in the SA cache.

SAs limit:

SA message limit for this MSDP peer.


Related Commands

Command
Description

ip msdp peer

Configures an MSDP peer.


show ip msdp sa-cache

To display (S, G) state learned from Multicast Source Discovery Protocol (MSDP) peers, use the show ip msdp sa-cache command in EXEC mode.

show ip msdp [vrf vrf-name] sa-cache [group-address | source-address | group-name | source-name] [group-address | source-address | group-name | source-name] [as-number]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

group-address | source-address | group-name | source-name

(Optional) Group address, source address, group name, or source name of the group or source about which (S, G) information is displayed. If two address or names are specified, an (S, G) entry corresponding to those addresses is displayed. If only one group address is specified, all sources for that group are displayed.

If no options are specified, the entire Source-Active (SA) cache is displayed.

as-number

(Optional) Only state originated by the autonomous system number specified is displayed.


Command Modes

EXEC

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

State is cached only if the ip msdp cache-sa-state command is configured.

Examples

The following is sample output from the show ip msdp sa-cache command:

Router# show ip msdp sa-cache

MSDP Source-Active Cache - 2398 entries
(172.16.41.33, 238.105.148.0), RP 172.16.3.111, MBGP/AS 704, 2d10h/00:05:33
(172.16.112.8, 224.2.0.1), RP 192.168.200.65, MBGP/AS 10888, 00:03:21/00:02:38
(172.16.10.13, 227.37.32.1), RP 192.168.3.92, MBGP/AS 704, 05:22:20/00:03:32
(172.16.66.18, 233.0.0.1), RP 192.168.3.111, MBGP/AS 704, 2d10h/00:05:35
(172.16.66.148, 233.0.0.1), RP 192.168.3.111, MBGP/AS 704, 2d10h/00:05:35
(172.16.10.13, 227.37.32.2), RP 192.168.3.92, MBGP/AS 704, 00:44:30/00:01:31
(172.16.70.203, 224.2.236.2), RP 192.168.253.7, MBGP/AS 3582, 02:34:16/00:05:49
(172.18.42.104, 236.195.56.2), RP 192.168.3.92, MBGP/AS 704, 04:21:13/00:05:22
(172.16.10.13, 227.37.32.3), RP 192.168.3.92, MBGP/AS 704, 00:44:30/00:02:31
(172.18.15.43, 224.0.92.3), RP 192.168.200.65, MBGP/AS 10888, 6d09h/00:05:35
(172.18.15.111, 224.0.92.3), RP 192.168.200.65, MBGP/AS 10888, 16:18:08/00:05:35
(172.18.21.45, 224.0.92.3), RP 192.168.200.65, MBGP/AS 10888, 16:18:08/00:05:35
(172.18.15.75, 224.0.92.3), RP 192.168.200.65, MBGP/AS 10888, 08:40:52/00:05:35
(172.18.15.100, 224.0.92.3), RP 192.168.200.65, MBGP/AS 10888, 08:40:52/00:05:35
(172.16.10.13, 227.37.32.6), RP 192.168.3.92, MBGP/AS 704, 00:45:30/00:05:31
(172.18.41.33, 224.247.228.10), RP 192.168.3.111, MBGP/AS 704, 2d10h/00:05:35
(172.18.222.210, 224.2.224.13), RP 192.168.3.92, MBGP/AS 704, 01:51:53/00:05:22
(172.18.41.33, 229.231.124.13), RP 192.168.3.111, MBGP/AS 704, 2d10h/00:05:33
(172.18.32.138, 224.2.200.23), RP 192.168.253.7, MBGP/AS 3582, 21:33:40/00:05:49
(172.18.75.244, 224.2.200.23), RP 192.168.253.7, MBGP/AS 3582, 21:33:40/00:05:49

Table 12 describes the significant fields shown in the display.

Table 12 show ip msdp sa-cache Field Descriptions 

Field
Description

(172.16.41.33, 238.105.148.0)

The first address (source) is sending to the second address (group).

RP 172.16.3.111

Rendezvous point (RP) address in the originating domain where the SA messages started.

MBGP/AS 704

RP is in autonomous system 704 according to multiprotocol Border Gateway Protocol (BGP).

2d10h/00:05:33

The route has been cached for 2 days and 10 hours. If no SA message is received in 5 minutes and 33 seconds, the route will be removed from the SA cache.


Related Commands

Command
Description

clear ip msdp sa-cache

Clears MSDP SA cache entries.

ip msdp cache-sa-state

Enables the router to create SA state.


show ip msdp summary

To display Multicast Source Discovery Protocol (MSDP) peer status, use the show ip msdp summary command in EXEC mode.

show ip msdp [vrf vrf-name] summary

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.


Command Modes

EXEC

Command History

Release
Modification

12.0(7)T

This command was introduced.

12.1(7)

This command was modified to display information about the number of SA messages from each MSDP peer in the SA cache.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Examples

The following is sample outputfrom of the show ip msdp summary command:

Router# show ip msdp summary

MSDP Peer Status Summary
Peer Address     AS    State    Uptime/  Reset SA    Peer Name
                                Downtime Count Count
224.135.250.116  109   Up       1d10h    9     111   rtp5-rp1
*172.20.240.253 1239  Up       14:24:00 5     4010  sl-rp-stk
172.16.253.19    109   Up       12:36:17 5     10    shinjuku-rp1
172.16.170.110   109   Up       1d11h    9     12    ams-rp1

Table 13 describes the significant fields shown in the display.

Table 13 show ip msdp summary Field Descriptions 

Field
Description

Peer Address

IP address of the MSDP peer.

AS

Autonomous system to which the MSDP peer belongs.

State

State of the MSDP peer.

Uptime/Downtime

Days and hours the MSDP peer is up or down, per state shown in the previous column. If the time is less than 24 hours, it is shown in terms of hours:minutes:seconds.

SA Count

Number of SA messages from this MSDP peer in the SA cache.

Peer Name

Name of the MSDP peer.


show ip pim bsr

To display the bootstrap router (BSR) information, use the show ip pim bsr command in EXEC mode.

show ip pim [vrf vrf-name] bsr

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.


Command Modes

EXEC

Command History

Release
Modification

11.3 T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

The output includes elected BSR information and information about the locally configured candidate rendezvous point (RP) advertisement.

Examples

The following is sample output from the show ip pim bsr command:

Router# show ip pim bsr

PIMv2 Bootstrap information
This system is the Bootstrap Router (BSR)
  BSR address: 172.16.143.28 
  Uptime: 04:37:59, BSR Priority: 4, Hash mask length: 30
  Next bootstrap message in 00:00:03 seconds

Next Cand_RP_advertisement in 00:00:03 seconds. 
  RP: 172.16.143.28(Ethernet0), Group acl: 6

Table 14 describes the significant fields shown in the display.

Table 14 show ip pim bsr Field Descriptions 

Field
Description

BSR address

IP address of the BSR.

Uptime

Length of time that this router has been up, in hours, minutes, and seconds.

BSR Priority

Priority as configured in the ip pim bsr-candidate command.

Hash mask length

Length of a mask (32 bits maximum) that is to be ANDed with the group address before the hash function is called. This value is configured in the ip pim bsr-candidate command.

Next bootstrap message in

Time (in hours, minutes, and seconds) in which the next bootstrap message is due from this BSR.

Next Cand_RP_advertisement in

Time (in hours, minutes, and seconds) in which the next candidate RP advertisement will be sent.

RP

List of IP addresses of RPs.

Group acl

Standard IP access list number that defines the group prefixes that are advertised in association with the RP address. This value is configured in the ip pim rp-candidate command.


Related Commands

Command
Description

ip pim bsr-candidate

Configures the router to announce its candidacy as a BSR.

ip pim rp-candidate

Configures the router to advertise itself as a PIM Version 2 candidate RP to the BSR.

show ip pim rp

Displays active RPs that are cached with associated multicast routing entries.

show ip pim rp-hash

Displays which RP is being selected for a specified group.


show ip pim interface

To display information about interfaces configured for Protocol Independent Multicast (PIM), use the show ip pim interface command in EXEC mode.

show ip pim [vrf vrf-name] interface [type number] [df | count] [rp-address] [detail]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

type number

(Optional) Interface type and number.

df

(Optional) When bidirectional PIM (bidir-PIM) is used, displays the IP address of the elected designated forwarder (DF) for each rendezvous point (RP) of an interface.

count

(Optional) Number of packets received and sent out the interface.

rp-address

(Optional) RP IP address.

detail

(Optional) PIM details of each interface.


Defaults

If no interface is specified, all interfaces are displayed.

Command Modes

EXEC

Command History

Release
Modification

10.0

This command was introduced.

11.2(11)GS

This command was integrated into Cisco IOS Release 11.2(11)GS.

12.0(5)T

The flag "H" was added in the output display to indicate that an outgoing interface is hardware-switched in the case of IP multicast Multilayer Switching (MLS).

12.1(2)T

The df keyword and rp-address argument were added.

12.1(5)T

The detail keyword was added.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

This command works only on interfaces that are configured for PIM.

Use the show ip pim interface count command to display switching counts for Multicast Distributed Switching (MDS) and other fast-switching statistics. For more information on MDS, refer to the "Configuring Multicast Distributed Switching" chapter in the Cisco IOS Switching Services Configuration Guide.

Examples

The following is sample output from the show ip pim interface command:

Router# show ip pim interface

Address          Interface          Mode    Neighbor  Query     DR
                                            Count     Interval
192.168.37.6      Ethernet0          Dense   2         30        192.168.37.33
192.168.36.129    Ethernet1          Dense   2         30        192.168.36.131
10.1.37.2        Tunnel0            Dense   1         30        224.0.0.0

The following is sample output from the show ip pim interface command when the count keyword is specified:

Router# show ip pim interface count

Address          Interface          FS  Mpackets In/Out
172.16.121.35    Ethernet0          *   548305239/13744856
172.16.121.35    Serial0.33         *   8256/67052912
192.168.12.73     Serial0.1719       *   219444/862191

The following is sample output from the show ip pim interface command when the count keyword is specified and IP multicast MLS is enabled. The example lists the PIM interfaces that are fast switched and process switched, and the packet counts for these interfaces. The flag "H" is added to interfaces where IP multicast MLS is enabled.

Router# show ip pim interface count

States: FS - Fast Switched, H - Hardware Switched
Address          Interface          FS  Mpackets In/Out
192.168.10.2       Vlan10             * H 40886/0
192.168.11.2       Vlan11             * H 0/40554
192.168.12.2       Vlan12             * H 0/40554
192.168.23.2       Vlan23             *   0/0
192.168.24.2       Vlan24             *   0/0

The following are two sample outputs from the show ip pim interface command when the df keyword is specified:

Router# show ip pim interface df

Interface          RP               DF Winner        Metric          Uptime
Ethernet3/3        10.10.0.2        10.4.0.2         0               00:03:49
                   10.10.0.3        10.4.0.3         0               00:01:49
                   10.10.0.5        10.4.0.4         409600          00:01:49
Ethernet3/4        10.10.0.2        10.5.0.2         0               00:03:49
                   10.10.0.3        10.5.0.2         409600          00:02:32
                   10.10.0.5        10.5.0.2         435200          00:02:16
Loopback0          10.10.0.2        10.10.0.2        0               00:03:49
                   10.10.0.3        10.10.0.2        409600          00:02:32
                   10.10.0.5        10.10.0.2        435200          00:02:16

Router# show ip pim interface Ethernet3/3 df 10.10.0.3

Designated Forwarder election for Ethernet3/3, 10.4.0.2, RP 10.10.0.3
  State                           Non-DF
  Offer count is                  0
  Current DF ip address           10.4.0.3
  DF winner up time               00:02:33
  Last winner metric preference   0
  Last winner metric              0

Table 15 describes the significant fields shown in the displays.

Table 15 show ip pim interface Field Descriptions 

Field
Description

Address

Interface IP address of the next hop router.

Interface

Interface type and number that is configured to run PIM.

Mode

Multicast mode in which the Cisco IOS software is operating. This can be dense mode or sparse mode. "DVMRP" indicates that a Distance Vector Multicast Routing Protocol tunnel is configured.

Neighbor Count

Number of PIM neighbors that have been discovered through this interface. If the Neighbor Count is 1 for a DVMRP tunnel, the neighbor is active (receiving probes and reports).

Query Interval

Frequency, in seconds, of PIM router query messages, as set by the ip pim query-interval interface configuration command. The default is 30 seconds.

DR

IP address of the designated router (DR) on a network. Note that serial lines do not have designated routers, so the IP address would be shown as 224.0.0.0.

FS

An asterisk (*) in this column indicates that fast switching is enabled.

Mpackets In/Out

Number of packets into and out of the interface since the router has been up.

RP

IP address of the RP.

DF Winner

IP address of the elected DF.

Metric

Unicast routing metric to the RP announced by the DF.

Uptime

Length of time the RP has been up, in days and hours. If less than 1 day, time is expressed in hours, minutes, and seconds.

State

Indicates whether the specified interface is an elected DF.

Offer count is

Number of PIM DF election offer messages that the router has sent out the interface during the current election interval.

Current DF ip address

IP address of the current DF.

DF winner up time

Length of time the current DF has been up, in days and hours. If less than 1 day, time is expressed in hours, minutes, and seconds.

Last winner metric preference

The preference value used for selecting the unicast routing metric to the RP announced by the DF.

Last winner metric

Unicast routing metric to the RP announced by the DF.


The following is sample output from the show ip pim interface command with the detail keyword for Fast Ethernet interface 0/1:

Router# show ip pim interface fastethernet 0/1 detail

FastEthernet0/1 is up, line protocol is up
  Internet address is 172.16.8.1/24
  Multicast switching:process
  Multicast packets in/out:0/0
  Multicast boundary:not set
  Multicast TTL threshold:0
  PIM:enabled
    PIM version:2, mode:dense
    PIM DR:172.16.8.1 (this system)
    PIM neighbor count:0
    PIM Hello/Query interval:30 seconds
	PIM State-Refresh processing:enabled
	PIM State-Refresh origination:enabled, interval:60 seconds
    PIM NBMA mode:disabled
    PIM ATM multipoint signalling:disabled
    PIM domain border:disabled
  Multicast Tagswitching:disabled

Table 16 describes the significant fields shown in the display.

Table 16 show ip pim interface detail Field Descriptions 

Field
Description

Internet address

IP address of the specified interface.

Multicast switching:

The type of multicast switching enabled on the interface: process, fast, or distributed.

Multicast boundary:

Indicates whether an administratively scoped boundary is configured.

Multicast TTL threshold:

The time-to-live (TTL) threshold of multicast packets being forwarded out the interface.

PIM:

Indicates whether PIM is enabled or disabled.

PIM version:

Indicates whether PIM version 1 or version 2 is configured.

PIM mode:

Indicates whether PIM sparse mode, dense mode, or sparse-dense mode is configured.

PIM DR:

The IP address of the DR.

PIM State-Refresh processing:

Indicates whether the processing of PIM state refresh control messages is enabled.

PIM State-Refresh origination:

Indicates whether the origination of the PIM state refresh control messages is enabled.

interval:

Indicates the configured interval for the origination of the PIM state refresh control messages. The available interval range is from 4 to 100 seconds.

PIM NBMA mode:

Indicates whether the interface is enabled for nonbroadcast multiaccess (NBMA) mode.

PIM ATM multipoint signalling:

Indicates whether the interface is enabled for ATM multipoint signaling.

PIM domain border:

Indicates whether the interface is enabled as a PIM domain border.

Multicast Tagswitching:

Indicates whether multicast tag switching is enabled.


Related Commands

Command
Description

ip pim

Enables PIM on an interface.

ip pim query-interval

Configures the frequency of PIM router query messages.

ip pim state-refresh disable

Disables the processing and forwarding of PIM dense mode state refresh control messages on a PIM router.

ip pim state-refresh origination-interval

Configures the origination of and the interval for PIM dense mode state refresh control messages on a PIM router.

show ip pim neighbor

Lists the PIM neighbors discovered by the Cisco IOS software.


show ip pim mdt bgp

To show detailed Border Gateway Protocol (BGP) advertisement of the route distinguisher (RD) for the multicast distribution tree (MDT) default group, use the show ip pim mdt bgp command in EXEC mode.

show ip pim [vrf vrf-name] mdt bgp

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.


Command Modes

EXEC

Command History

Release
Modification

12.0(23)S

This command was introduced.


Usage Guidelines

Use this command to show detailed BGP advertisement of the RD for the MDT default group.

Examples

The following is sample output from the show ip pim mdt bgp command:

Router# show ip pim mdt bgp

MDT-default group 232.2.1.4
 rid:1.1.1.1 next_hop:1.1.1.1

Table 17 describes the significant fields shown in the display.

Table 17 show ip pim mdt bgp Field Descriptions 

Field
Description

MDT-default group

The MDT default groups that have been advertised to this router.

rid:10.1.1.1

The BGP router ID of the advertising router.

next_hop:10.1.1.1

The BGP next-hop address that was contained in the advertisement.


show ip pim mdt history

To provide information on data MDTs that have been reused, use the show ip pim mdt history command in EXEC mode.

show ip pim [vrf vrf-name] mdt history interval {number}

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

interval

Interval during which data MDTs have been reused.

minutes

Length of time, in minutes, for which the interval can be configured.


Command Modes

EXEC

Command History

Release
Modification

12.0(23)S

This command was introduced.


Usage Guidelines

The show ip pim mdt history command displays the data MDTs that have been reused during the past configured interval.

Examples

The following is sample output from the show ip pim mdt history command with the interval configured to be 20 minutes:

Router# show ip pim vrf blue mdt history interval 20

   MDT-data send history for VRF - blue for the past 20 minutes

MDT-data group        Number of reuse
     10.9.9.8           3
     10.9.9.9           2

Table 18 describes the significant fields shown in the display.

Table 18 show ip pim mdt history Field Descriptions 

Field
Description

MDT-data group

The MDT data group for which information is being shown.

Number of reuse

The number of data MDTs that have been reused in this group.


show ip pim mdt receive

To show the data multicast distribution tree (MDT) advertisements received by a specified router, use the show ip pim mdt receive command in EXEC mode.

show ip pim [vrf vrf-name] mdt receive [detail]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

detail

(Optional) Provides a detailed description of the data MDT advertisements received.


Command Modes

EXEC

Command History

Release
Modification

12.0(23)S

This command was introduced.


Usage Guidelines

When a router wants to switch over from the default MDT to a data MDT, it advertises the VRF source, the group pair, and the global multicast address over which the traffic will be sent. If the remote router wants to receive this data, then it will join this global adddress multicast group.

Examples

The following is sample output from the show ip pim mdt receive command using the detail keyword for further information:

Router# show ip pim vrf vpn8 mdt receive detail

Joined MDT-data groups for VRF:vpn8
group:232.2.8.0 source:10.0.0.100 ref_count:13
(10.101.8.10, 225.1.8.1), 1d13h/00:03:28/00:02:26, OIF count:1, flags:TY
(10.102.8.10, 225.1.8.1), 1d13h/00:03:28/00:02:27, OIF count:1, flags:TY

Table 19 describes the significant fields shown in the display.

Table 19 show ip pim mdt receive Field Descriptions 

Field
Description

group:172.16.8.0

Group that caused the data MDT to be built.

source:10.0.0.100

VRF source that caused the data MDT to be built.

ref_count:13

Number of source, group pairs that are reusing this data MDT.

OIF count:1

Number of interfaces out of which this multicast data is being forwarded.

flags:

Information about the entry.

A - Candidate MSDP advertisement
B - Bidir Group
D - Dense
C - Connected
F - Register flag
I - Received source-specific host report
J - Join SPT
L - Local
M - MSDP created entry
P - Pruned
R - RP bit set
S - Sparse
s - SSM group
T - SPT bit set
X - Proxy join timer running
U -URD
Y - Joined MDT data group
y - Sending to MDT data group
Z - Multicast tunnel


show ip pim mdt send

To show the data multicast distribution tree (MDT) advertisements that a specified router has made, use the show ip pim mdt send command in EXEC mode.

show ip pim [vrf vrf-name] mdt send

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.


Command Modes

EXEC

Command History

Release
Modification

12.0(23)S

This command was introduced.


Usage Guidelines

Use this command to show the data MDT advertisements that a specified router has made.

Examples

The following is sample output from the show ip pim mdt send command:

Router# show ip pim mdt send

MDT-data send list for VRF:vpn8
  (source, group)                     MDT-data group      ref_count
  (10.100.8.10, 225.1.8.1)            232.2.8.0           1
  (10.100.8.10, 225.1.8.2)            232.2.8.1           1
  (10.100.8.10, 225.1.8.3)            232.2.8.2           1
  (10.100.8.10, 225.1.8.4)            232.2.8.3           1
  (10.100.8.10, 225.1.8.5)            232.2.8.4           1
  (10.100.8.10, 225.1.8.6)            232.2.8.5           1
  (10.100.8.10, 225.1.8.7)            232.2.8.6           1
  (10.100.8.10, 225.1.8.8)            232.2.8.7           1
  (10.100.8.10, 225.1.8.9)            232.2.8.8           1
  (10.100.8.10, 225.1.8.10)           232.2.8.9           1

Table 20 describes the significant fields shown in the display.

Table 20 show ip pim mdt send Field Descriptions 

Field
Description

source, group

Source and group addresses that this router has switched over to data MDTs.

MDT-data group

Multicast address over which these data MDTs are being sent.

ref_count

Number of source, group pairs that are reusing this data MDT.


show ip pim neighbor

To list the Protocol Independent Multicast (PIM) neighbors discovered by the Cisco IOS software, use the show ip pim neighbor command in EXEC mode.

show ip pim [vrf vrf-name] neighbor [interface-type interface-number]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

interface-type

(Optional) Interface type.

interface-number

(Optional) Interface number.


Command Modes

EXEC

Command History

Release
Modification

10.0

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

Use this command to determine which routers on the LAN are configured for PIM.

Examples

The following is sample output from the show ip pim neighbor command:

Router# show ip pim neighbor

PIM Neighbor Table
Neighbor Address  Interface          Uptime    Expires   Mode
192.168.37.2       Ethernet0          17:38:16  0:01:25   Dense
192.168.37.33      Ethernet0          17:33:20  0:01:05   Dense (DR)
192.168.36.131     Ethernet1          17:33:20  0:01:08   Dense (DR)
192.168.36.130     Ethernet1          18:56:06  0:01:04   Dense
10.1.22.9         Tunnel0            19:14:59  0:01:09   Dense

Table 21 describes the significant fields shown in the display.

Table 21 show ip pim neighbor Field Descriptions 

Field
Description

Neighbor Address

IP address of the PIM neighbor.

Interface

Interface type and number on which the neighbor is reachable.

Uptime

How long (in hours, minutes, and seconds) the entry has been in the PIM neighbor table.

Expires

How long (in hours, minutes, and seconds) until the entry will be removed from the IP multicast routing table.

Mode

Mode in which the interface is operating.

(DR)

Indicates that this neighbor is a designated router on the LAN.


Related Commands

Command
Description

ip pim state-refresh disable

Disables the processing and forwarding of PIM Dense Mode State Refresh feature control messages on a PIM router.

ip pim state-refresh origination-interval

Configures the origination of and the interval for the PIM Dense Mode State Refresh feature control messages on a PIM router.

show ip pim interface

Displays information about interfaces configured for PIM.


show ip pim rp

To display active rendezvous points (RPs) that are cached with associated multicast routing entries, use the show ip pim rp command in EXEC mode.

show ip pim [vrf vrf-name] rp [mapping | metric] [rp-address]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

mapping

(Optional) Displays all group-to-RP mappings of which the router is aware (either configured or learned from Auto-RP).

metric

(Optional) Displays the unicast routing metric to the RPs configured statically or learned via Auto-RP or the bootstrap router (BSR).

rp-address

(Optional) RP IP address.


Defaults

If no RP is specified, all active RPs are displayed.

Command Modes

EXEC

Command History

Release
Modification

10.2

This command was introduced.

12.1(2)T

The metric keyword and rp-address argument were added.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Examples

The following is sample output from the show ip pim rp command:

Router# show ip pim rp

Group:227.7.7.7, RP:10.10.0.2, v2, v1, next RP-reachable in 00:00:48

The following is sample output from the show ip pim rp command when the mapping keyword is specified:

Router# show ip pim rp mapping

PIM Group-to-RP Mappings
This system is an RP (Auto-RP)
This system is an RP-mapping agent

Group(s) 227.0.0.0/8
  RP 10.10.0.2 (?), v2v1, bidir
    Info source:10.10.0.2 (?), via Auto-RP
         Uptime:00:01:42, expires:00:00:32
Group(s) 228.0.0.0/8
  RP 10.10.0.3 (?), v2v1, bidir
    Info source:10.10.0.3 (?), via Auto-RP
         Uptime:00:01:26, expires:00:00:34
Group(s) 229.0.0.0/8
  RP 10.10.0.5 (mcast1.cisco.com), v2v1, bidir
    Info source:10.10.0.5 (mcast1.cisco.com), via Auto-RP
         Uptime:00:00:52, expires:00:00:37
Group(s) (-)230.0.0.0/8
  RP 10.10.0.5 (mcast1.cisco.com), v2v1, bidir
    Info source:10.10.0.5 (mcast1.cisco.com), via Auto-RP
         Uptime:00:00:52, expires:00:00:37

The following is sample output from the show ip pim rp command when the metric keyword is specified:

Router# show ip pim rp metric

RP Address      Metric Pref    Metric       Flags   RPF Type   Interface
10.10.0.2       0              0              L     unicast    Loopback0
10.10.0.3       90             409600         L     unicast    Ethernet3/3
10.10.0.5       90             435200         L     unicast    Ethernet3/3

Table 22 describes the significant fields shown in the displays.

Table 22 show ip pim rp Field Descriptions 

Field
Description

Group

Address of the multicast group about which to display RP information.

RP

Address of the RP for that group.

v2

Indicates that the RP is running Protocol Independent Multicast (PIM) version 2.

v1

Indicates that the RP is running PIM version 1.

bidir

Indicates that the RP is operating in bidirectional mode.

Info source

RP mapping agent that advertised the mapping.

(?)

Indicates that no Domain Name System (DNS) name has been specified.

via Auto-RP

Indicates that RP was learned via Auto-RP.

Uptime

Length of time the RP has been up (in days and hours). If less than 1 day, time is expressed in hours, minutes, and seconds.

expires

Time in (hours, minutes, and seconds) in which the entry will expire.

Metric Pref

The preference value used for selecting the unicast routing metric to the RP announced by the designated forwarder (DF).

Metric

Unicast routing metric to the RP announced by the DF.

Flags

Indicates the flags set for the specified RP. The following are descriptions of possible flags:

C—RP is configured.

L—RP learned via Auto-RP or the BSR.

RPF Type

Routing table from which this route was obtained, either unicast, Distance Vector Multicast Routing Protocol (DVMRP), or static mroute.

Interface

Interface type and number that is configured to run PIM.


show ip pim rp-hash (BSR)

To display which rendezvous point (RP) is being selected for a specified group, use the show ip pim rp-hash command in EXEC mode.

show ip pim [vrf vrf-name] rp-hash {group-address | group-name}

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

group-address | group-name

Displays the RP information for the specified group address or name as defined in the Domain Name System (DNS) hosts table.


Command Modes

EXEC

Command History

Release
Modification

11.3 T

This command was introduced.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

This command displays which RP was selected for the group specified. It also shows whether this RP was selected by Auto-RP or the PIM Version 2 bootstrap mechanism.

Examples

The following is sample output from the show ip pim rp-hash command with the group address 239.1.1.1 specified:

Router# show ip pim rp-hash 239.1.1.1

RP 172.16.24.12 (mt1-47a.cisco.com), v2
    Info source: 172.16.24.12 (mt1-47a.cisco.com), via bootstrap
         Uptime: 05:15:33, expires: 00:02:01

Table 23 describes the significant fields shown in the display.

Table 23 show ip pim rp-hash Field Descriptions 

Field
Description

RP 172.16.24.12 (mt1-47a.cisco.com), v2

Address of the RP for the group specified (239.1.1.1). Within parentheses is the DNS name of the RP. If the address of the RP is not registered in the DNS, a question mark (?) is displayed. PIM Version 2 configured.

Info source: 172.16.24.12 (mt1-47a.cisco.com), via bootstrap

Indicates from which system the router learned this RP information, along with the DNS name of the source. RP was selected by the bootstrap mechanism. In this case, the BSR is also the RP.

Uptime

Length of time (in hours, minutes, and seconds) that the router has known about this RP.

expires

Time (in hours, minutes, and seconds) after which the information about this RP expires. If the router does not receive any refresh messages in this time, it will discard information about this RP.


show ip rpf

To display how IP multicast routing does Reverse Path Forwarding (RPF), use the show ip rpf command in EXEC mode.

show ip rpf [vrf vrf-name] {source-address | source-name} [metric]

Syntax Description

vrf

(Optional) Supports the Multicast Virtual Private Network (VPN) routing and forwarding (VRF) instance.

vrf-name

(Optional) Name assigned to the VRF.

source-address | source-name

Displays the RPF information for the specified source address or name.

metric

(Optional) Displays the unicast routing metric.


Defaults

If no source is specified, all sources are displayed.

Command Modes

EXEC

Command History

Release
Modification

11.0

This command was introduced.

12.1(2)T

The metric keyword was added.

12.0(23)S

The vrf keyword and vrf-name argument were added.


Usage Guidelines

The router can reverse path forward from multiple routing tables (that is, the unicast routing table, Distance Vector Multicast Routing Protocol (DVMRP) routing table, or static mroutes). This command tells you from where the information is retrieved.

Examples

The following is sample output from the show ip rpf command:

Router# show ip rpf 172.16.10.13

RPF information for sj.cisco.com (172.16.10.13)
  RPF interface: BRI0
  RPF neighbor: sj1.cisco.com (172.16.121.10)
  RPF route/mask: 172.16.0.0/255.255.0.0
  RPF type: unicast
  RPF recursion count: 0
  Doing distance-preferred lookups across tables

The following is sample output of the show ip rpf command when the metric keyword is specified:

Router# show ip rpf 172.16.10.13 metric

RPF information for sj.cisco.com (172.16.10.13)
  RPF interface: BRI0
  RPF neighbor: sj1.cisco.com (172.16.121.10)
  RPF route/mask: 172.16.0.0/255.255.0.0
  RPF type: unicast
  RPF recursion count: 0
  Doing distance-preferred lookups across tables
  Metric preference: 110
  Metric: 11

Table 24 describes the significant fields shown in the display.

Table 24 show ip rpf Field Descriptions

Field
Description

RPF information for <host name (source address)>

Host name and source address that this information concerns.

RPF interface

For the given source, the interface from which the router expects to get packets.

RPF neighbor

For given source, the neighbor from which the router expects to get packets.

RPF route/mask

Route number and mask that matched against this source.

RPF type

Routing table from which this route was obtained, either unicast, DVMRP, or static mroutes.

RPF recursion count

Indicates the number of times the route is recursively resolved.

Doing distance-preferred...

Indicates whether RPF was determined based on distance or length of mask.

Metric preference

The preference value used for selecting the unicast routing metric to the RP announced by the designated forwarder (DF).

Metric

Unicast routing metric to the RP announced by the DF.