Cisco Systems 3750E Configuring Advanced PIM Features

42-25

Catalyst 3750-E and 3560-E Switch Software Configuration Guide

OL-9775-02

Chapter42 Configuring IP Multicast Routi ng

Configuring Advanced PIM Features

To monitor the RP mapping information, use these commands in privileged EXEC mode:

•show ip pim bsr displays information about the elected BSR.

•show ip pim rp-hash group displays the RP that was selected for the specified group.

•show ip pim rp [group-name | group-address | mapping] displays how the switch learns of the RP

(through the BSR or the Auto-RP mechanism).

When debugging interoperability problems between PIMv1 and PIMv2, check these in the order shown:

1. Verify RP mapping with the show ip pim rp-hash privileged EXEC command, making sure that all

systems agree on the same RP for the same group.

2. Verify interoperability between different versions of DRs and RPs. Make sure the RPs are

interacting with the DRs properly (by responding with register-stops and forwarding decapsulated

data packets from registers).

Configuring Advanced PIM Features

These sections describe the optional advanced PIM features:

•Understanding PIM Shared Tree and Source Tree, page 42-25

•Delaying the Use of PIM Shortest-Path Tree, page 42-27 (optional)

•Modifying the PIM Router-Query Message Interval, page 42-28 (optional)

By default, members of a group receive data from senders to the group across a singl e data-distribution

tree rooted at the RP. Figure42-5 shows this type of shared-distribution tree. Data from senders is

delivered to the RP for distribution to group members joined to the shared tree.