Release 15.1SY Supervisor Engine 720 Software Configuration Guide
IPv6 Multicast Layer 3 Features
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IPv6 Multicast PFC3 and DFC3 Layer 3 Switching

Table Of Contents

IPv6 Multicast PFC3 and DFC3 Layer 3 Switching

Prerequisites for IPv6 Multicast

Restrictions for IPv6 Multicast

Features that Support IPv6 Multicast

How to Configure IPv6 Multicast Layer 3 Switching

Using show Commands to Verify IPv6 Multicast Layer 3 Switching

Verifying MFIB Clients

Displaying the Switching Capability

Verifying the (S,G) Forwarding Capability

Verifying the (*,G) Forwarding Capability

Verifying the Subnet Entry Support Status

Verifying the Current Replication Mode

Displaying the Replication Mode Auto-Detection Status

Displaying the Replication Mode Capabilities

Displaying Subnet Entries

Displaying the IPv6 Multicast Summary

Displaying the NetFlow Hardware Forwarding Count

Displaying the FIB Hardware Bridging and Drop Counts

Displaying the Shared and Well-Known Hardware Adjacency Counters


IPv6 Multicast PFC3 and DFC3 Layer 3 Switching


Prerequisites for IPv6 Multicast

Restrictions for IPv6 Multicast

Features that Support IPv6 Multicast

How to Configure IPv6 Multicast Layer 3 Switching

Using show Commands to Verify IPv6 Multicast Layer 3 Switching


NoteFor complete syntax and usage information for the commands used in this chapter, see these publications:

http://www.cisco.com/en/US/products/ps11846/prod_command_reference_list.html

Cisco IOS Release 15.1SY supports only Ethernet interfaces. Cisco IOS Release 15.1SY does not support any WAN features or commands.



Tip For additional information about Cisco Catalyst 6500 Series Switches (including configuration examples and troubleshooting information), see the documents listed on this page:

http://www.cisco.com/en/US/products/hw/switches/ps708/tsd_products_support_series_home.html

Participate in the Technical Documentation Ideas forum


Prerequisites for IPv6 Multicast

None.

Restrictions for IPv6 Multicast

The PFC3 and DFC3 provide hardware support for the following:

Completely switched IPv6 multicast flows

IPv6 PIM-Sparse Mode (PIM-SM) (S,G) and (*,G) forwarding

Multicast RPF check for IPv6 PIM-SM (S,G) traffic using the NetFlow table

Rate limiting of IPv6 PIM-SM (S,G) traffic that fails the multicast RPF check

Static IPv6 multicast routes

SSM Mapping for IPv6 (PIM-SSM)

IPv6 multicast forwarding information base (MFIB) using the NetFlow table

IPv6 distributed MFIB (dMFIB) using the NetFlow table

Link-local and link-global IPv6 multicast scopes

Egress multicast replication with the ipv6 mfib hardware-switching command

Ingress interface statistics for multicast routes (egress interface statistics not available)

RPR redundancy mode (see Chapter 9 "Route Processor Redundancy (RPR)")

Ingress and egress PFC QoS (see Chapter 58 "PFC QoS")

Input and output Cisco access-control lists (ACLs)

The PFC3 and DFC3 do not provide hardware support for the following:

Partially switched IPv6 multicast flows

Multicast RPF check for PIM-SM (*,G) traffic

Multicast helper maps

Site-local multicast scopes

Manually configured IPv6 over IPv4 tunnels

IPv6 multicast 6to4 tunnels

IPv6 multicast automatic tunnels

IPv6 over GRE tunnels

IPv6-in-IPv6 PIM register tunnels

IPv6 multicast basic ISATAP tunnels

ISATAP tunnels with embedded 6to4 tunnels

Features that Support IPv6 Multicast

These features support IPv6 multicast:

RPR redundancy mode—See Chapter 9 "Route Processor Redundancy (RPR)."

Multicast Listener Discovery version 2 (MLDv2) snooping—See Chapter 47 "IPv6 MLD Snooping."


Note MLDv1 snooping is not supported.


IPv6 Multicast rate limiters—See Chapter 69 "Denial of Service (DoS) Protection."

IPv6 Multicast: Bootstrap Router (BSR)—See the BSR information in the Cisco IOS IPv6 Configuration Library and the Cisco IOS IPv6 Command Reference.

IPv6 Access Services—See DHCPv6 Prefix Delegation—See this publication for more information:

http://www.cisco.com/en/US/docs/ios/12_2t/ipv6/ipv6_vgf.html

SSM mapping for IPv6—See this publication for more information:

http://www.cisco.com/en/US/docs/ios-xml/ios/ipmulti_pim/configuration/15-sy/ip6-mcast-ssm-map.html

How to Configure IPv6 Multicast Layer 3 Switching

To configure IPv6 multicast Layer 3 switching, perform this task:

 
Command
Purpose

Step 1 

Router(config)# ipv6 unicast-routing

Enables unicast routing on all Layer 3 interfaces.

Step 2 

Router(config)# ipv6 multicast-routing

Enables PIM-SM on all Layer 3 interfaces.

Step 3 

Router(config)# ipv6 mfib hardware-switching

Enables MFIB hardware switching globally.

Using show Commands to Verify IPv6 Multicast Layer 3 Switching

Verifying MFIB Clients

Displaying the Switching Capability

Verifying the (S,G) Forwarding Capability

Verifying the (*,G) Forwarding Capability

Verifying the Subnet Entry Support Status

Verifying the Current Replication Mode

Displaying the Replication Mode Auto-Detection Status

Displaying the Replication Mode Capabilities

Displaying Subnet Entries

Displaying the IPv6 Multicast Summary

Displaying the NetFlow Hardware Forwarding Count

Displaying the FIB Hardware Bridging and Drop Counts

Displaying the Shared and Well-Known Hardware Adjacency Counters


Note The show commands in the following sections are for a switch with a DFC3-equipped switching module in slot 1 and a Supervisor Engine 720 with a PFC3 in slot 6.


Verifying MFIB Clients

This example shows the complete output of the show ipv6 mrib client command:

Router# show ipv6 mrib client 
IP MRIB client-connections
mfib ipv6:81    (connection id 0)
igmp:124        (connection id 1)
pim:281 (connection id 2)
slot 1  mfib ipv6 rp agent:15   (connection id 3)
slot 6  mfib ipv6 rp agent:15   (connection id 4)
 
   

This example shows how to display the MFIB client running on the route processor (RP):

Router# show ipv6 mrib client | include ^mfib ipv6 
mfib ipv6:81    (connection id 0)
 
   

This example shows how to display the MFIB clients running on the PFC3 and any DFC3s:

Router# show ipv6 mrib client | include slot 
slot 1  mfib ipv6 rp agent:15   (connection id 3)
slot 6  mfib ipv6 rp agent:15   (connection id 4)

Displaying the Switching Capability

This example displays the complete output of the show platform software ipv6-multicast capability command:

Router# show platform software ipv6-multicast capability 
 
   
 Hardware switching for IPv6 is enabled
 (S,G) forwarding for IPv6 supported using Netflow
 (*,G) bridging for IPv6 is supported using FIB
 Directly-connected entries for IPv6 is supported using ACL-TCAM.
 
   
Current System HW Replication Mode : Ingress
Auto-detection of Replication Mode : ON
 
   
Slot Replication-Capability Replication-Mode
   1 Ingress                Ingress 
   2 Egress                 Ingress 
   6 Egress                 Ingress 
   8 Ingress                Ingress 

Verifying the (S,G) Forwarding Capability

This example shows how to verify the (S,G) forwarding:

Router# show platform software ipv6-multicast capability | include (S,G) 
 (S,G) forwarding for IPv6 supported using Netflow

Verifying the (*,G) Forwarding Capability

This example shows how to verify the (*,G) forwarding:

Router# show platform software ipv6-multicast capability | include (\*,G) 
 (*,G) bridging for IPv6 is supported using FIB

Verifying the Subnet Entry Support Status

This example shows how to verify the subnet entry support status:

Router# show platform software ipv6-multicast capability | include entries 
 Directly-connected entries for IPv6 is supported using ACL-TCAM.

Verifying the Current Replication Mode

This example shows how to verify the current replication mode:

Router# show platform software ipv6-multicast capability | include Current 
Current System HW Replication Mode : Ingress

Note Enter the no ipv6 mfib hardware-switching replication-mode ingress command to enable replication mode auto-detection.


Displaying the Replication Mode Auto-Detection Status

This example shows how to display the replication mode auto-detection status:

Router# show platform software ipv6-multicast capability | include detection 
Auto-detection of Replication Mode : ON

Displaying the Replication Mode Capabilities

This example shows how to display the replication mode capabilities of the installed modules:

Router# show platform software ipv6-multicast capability | begin ^Slot 
Slot Replication-Capability Replication-Mode
   1 Ingress                Ingress 
   2 Egress                 Ingress 
   6 Egress                 Ingress 
   8 Ingress                Ingress 

Displaying Subnet Entries

This example shows how to display subnet entries:

Router# show platform software ipv6-multicast connected 
IPv6 Multicast Subnet entries
Flags : H - Installed in ACL-TCAM
        X - Not installed in ACL-TCAM due to
            label-full exception
Interface: Vlan20 [ H ]
         S:20::1 G:FF00::
Interface: Vlan10 [ H ]
         S:10::1 G:FF00::

Note In this example, there are subnet entries for VLAN 10 and VLAN 20.


Displaying the IPv6 Multicast Summary

This example shows how to display the IPv6 multicast summary:

Router# show platform software ipv6-multicast summary 
IPv6 Multicast Netflow SC summary on Slot[1]:
Shortcut Type               Shortcut count
---------------------------+--------------
(S, G)                      100
(*, G)                      0
IPv6 Multicast FIB SC summary on Slot[1]:
Shortcut Type               Shortcut count
---------------------------+--------------
(*, G/128)                  10
(*, G/m)                    47
 
   
IPv6 Multicast Netflow SC summary on Slot[6]:
Shortcut Type               Shortcut count
---------------------------+--------------
(S, G)                      100
(*, G)                      0
IPv6 Multicast FIB SC summary on Slot[6]:
Shortcut Type               Shortcut count
---------------------------+--------------
(*, G/128)                  10
(*, G/m)                    47

Displaying the NetFlow Hardware Forwarding Count

This example shows how to display the NetFlow hardware forwarding count:

Router# show platform software ipv6-multicast summary 
IPv6 Multicast Netflow SC summary on Slot[1]:
Shortcut Type               Shortcut count
---------------------------+--------------
(S, G)                      100
(*, G)                      0
 
   
<...Output deleted...>
 
   
IPv6 Multicast Netflow SC summary on Slot[6]:
Shortcut Type               Shortcut count
---------------------------+--------------
(S, G)                      100
(*, G)                      0
<...Output truncated...>
 
   

Note The NetFlow (*, G) count is always zero because PIM-SM (*,G) forwarding is supported in software on the RP.


Displaying the FIB Hardware Bridging and Drop Counts

This example shows how to display the FIB hardware bridging and drop hardware counts:

Router# show platform software ipv6-multicast summary | begin FIB 
IPv6 Multicast FIB SC summary on Slot[1]:
Shortcut Type               Shortcut count
---------------------------+--------------
(*, G/128)                  10
(*, G/m)                    47
 
   
<...Output deleted...>
 
   
IPv6 Multicast FIB SC summary on Slot[6]:
Shortcut Type               Shortcut count
---------------------------+--------------
(*, G/128)                  10
(*, G/m)                    47
 
   

NoteThe (*, G/128) value is a hardware bridge entry count.

The (*, G/m) value is a hardware bridge/drop entry count.


Displaying the Shared and Well-Known Hardware Adjacency Counters

The show platform software ipv6-multicast shared-adjacencies command displays the shared and well-known hardware adjacency counters used for IPv6 multicast by entries in FIB and ACL-TCAM.

Router# show platform software ipv6-multicast shared-adjacencies 
 
   
---- SLOT [1] ----
 
   
Shared IPv6 Mcast Adjacencies Index  Packets       Bytes
----------------------------- ------ ------------- ------------------
Subnet bridge adjacency       0x7F802  0             0                 
Control bridge adjacency      0x7      0             0                 
StarG_M bridge adjacency      0x8      0             0                 
S_G bridge adjacency          0x9      0             0                 
Default drop adjacency        0xA      0             0                 
StarG (spt == INF) adjacency  0xB      0             0                 
StarG (spt != INF) adjacency  0xC      0             0                 
 
   
---- SLOT [6] ----
 
   
Shared IPv6 Mcast Adjacencies Index  Packets       Bytes
----------------------------- ------ ------------- ------------------
Subnet bridge adjacency       0x7F802  0             0                 
Control bridge adjacency      0x7      0             0                 
StarG_M bridge adjacency      0x8      0             0                 
S_G bridge adjacency          0x9      0             0                 
Default drop adjacency        0xA      28237         3146058           
StarG (spt == INF) adjacency  0xB      0             0                 
StarG (spt != INF) adjacency  0xC      0             0 
 
   

Tip For additional information about Cisco Catalyst 6500 Series Switches (including configuration examples and troubleshooting information), see the documents listed on this page:

http://www.cisco.com/en/US/products/hw/switches/ps708/tsd_products_support_series_home.html

Participate in the Technical Documentation Ideas forum