Configuring PIM MIB Extension for IP Multicast

Information About PIM MIB Extension for IP Multicast

PIM MIB Extensions for SNMP Traps for IP Multicast

Protocol Independent Multicast (PIM) is an IP multicast routing protocol used for routing multicast data packets to multicast groups. RFC 2934 defines the PIM MIB for IPv4, which describes managed objects that enable users to remotely monitor and configure PIM using Simple Network Management Protocol (SNMP).

PIM MIB extensions introduce the following new classes of PIM notifications:

  • neighbor-change--This notification results from the following conditions:
    • A router’s PIM interface is disabled or enabled (using the ip pim command in interface configuration mode)
    • A router's PIM neighbor adjacency expires (defined in RFC 2934)

  • rp-mapping-change--This notification results from a change in the rendezvous point (RP) mapping information due to either Auto-RP messages or bootstrap router (BSR) messages.

  • invalid-pim-message--This notification results from the following conditions:
    • An invalid (*, G) Join or Prune message is received by the device (for example, when a router receives a Join or Prune message for which the RP specified in the packet is not the RP for the multicast group)
    • An invalid PIM register message is received by the device (for example, when a router receives a register message from a multicast group for which it is not the RP)

Benefits of PIM MIB Extensions

PIM MIB extensions:

  • Allow users to identify changes in the multicast topology of their network by detecting changes in the RP mapping.

  • Provide traps to monitor the PIM protocol on PIM-enabled interfaces.

  • Help users identify routing issues when multicast neighbor adjacencies expire on a multicast interface.

  • Enable users to monitor RP configuration errors (for example, errors due to flapping in dynamic RP allocation protocols like Auto-RP).

How to Configure PIM MIB Extension for IP Multicast

Enabling PIM MIB Extensions for IP Multicast

Perform this task to enable PIM MIB extensions for IP multicast.


Note
  • The pimInterfaceVersion object was removed from RFC 2934 and, therefore, is no longer supported in software.
  • The following MIB tables are not supported in Cisco software:
    • pimIpMRouteTable
    • pimIpMRouteNextHopTable

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. snmp-server enable traps pim [neighbor-change | rp-mapping-change | invalid-pim-message ]
  4. snmp-server host host-address [traps | informs ] community-string pim

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

snmp-server enable traps pim [neighbor-change | rp-mapping-change | invalid-pim-message ]

Example:


Device(config)# snmp-server enable traps pim neighbor-change

Enables a device to send PIM notifications.

  • neighbor-change --This keyword enables notifications indicating when a device’s PIM interface is disabled or enabled, or when a device’s PIM neighbor adjacency expires.

  • rp-mapping-change --This keyword enables notifications indicating a change in RP mapping information due to either Auto-RP messages or BSR messages.

  • invalid-pim-message --This keyword enables notifications for monitoring invalid PIM protocol operations (for example, when a device receives a join or prune message for which the RP specified in the packet is not the RP for the multicast group or when a device receives a register message from a multicast group for which it is not the RP).

Step 4

snmp-server host host-address [traps | informs ] community-string pim

Example:


Device(config)# snmp-server host 10.10.10.10 traps public pim

Specifies the recipient of a PIM SNMP notification operation.

Configuration Examples for PIM MIB Extensions

Example Enabling PIM MIB Extensions for IP Multicast

The following example shows how to configure a router to generate notifications indicating that a PIM interface of the router has been enabled. The first line configures PIM traps to be sent as SNMP v2c traps to the host with IP address 10.0.0.1. The second line configures the router to send the neighbor-change class of trap notification to the host. 


snmp-server host 10.0.0.1 traps version 2c public pim 
snmp-server enable traps pim neighbor-change 
interface ethernet0/0 
 ip pim sparse-mode

Additional References

Related Documents

Related Topic

Document Title

Cisco IOS commands

Cisco IOS Master Commands List, All Releases

IP multicast commands

Cisco IOS IP Multicast Command Reference

Standards and RFCs

Standard/RFC

Title

draft-kouvelas-pim-bidir-new-00.txt

A New Proposal for Bi-directional PIM

RFC 1112

Host Extensions for IP Multicasting

RFC 1918

Address Allocation for Private Internets

RFC 2770

GLOP Addressing in 233/8

RFC 3569

An Overview of Source-Specific Multicast (SSM)

MIBs

MIB

MIBs Link

No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature.

To locate and download MIBs for selected platforms, Cisco software releases, and feature sets, use Cisco MIB Locator found at the following URL:

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

Technical Assistance

Description

Link

The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

http://www.cisco.com/cisco/web/support/index.html