3Com Switch 7750 Configuration Guide

Troubleshooting PIM 479
[SW7750-Vlan-interface10] pim sm
[SW7750-Vlan-interface10] quit
[SW7750] interface Vlan-interface 11
[SW7750-Vlan-interface11] pim sm
[SW7750-Vlan-interface11] quit
[SW7750] interface Vlan-interface 12
[SW7750-Vlan-interface12] pim sm
[SW7750-Vlan-interface12] quit
# Configure candidate BSRs.
[SW7750] pim
[SW7750-pim] c-bsr Vlan-interface 10 30
# Configure candidate RPs.
[SW7750] acl number 2000
[SW7750-acl-basic-2000] rule permit source 225.0.0.0 0.255.255.255
[SW7750] pim
[SW7750-pim] c-rp Vlan-interface 10 group-policy 2000
# Configure a PIM domain boundary.
[SW7750] interface Vlan-interface 12
[SW7750-Vlan-interface12] pim bsr-boundary
When Vlan-interface 12 is configured as the PIM domain boundary, LS_D cannot
receive BSR information from LS_B any mote, that is, LS_D is excluded from the
PIM domain.
■ Configure LS_C
The configuration on LS_C is similar to the configuration on LS_A.
Troubleshooting PIM Symptom 1: The router cannot set up multicast routing tables correctly.
Solution: You can troubleshoot PIM according to the following procedure.
Make sure that the unicast routing is right before troubleshooting PIM.
■ Because PIM-SM needs the support of RP and BSR, you must execute the
display pim bsr-info command to see whether BSR information exists. If not,
you must check whether there are unicast routes to the BSR. Then use the
display pim rp-info command to check whether the RP information is right. If
RP information does not exist, you must check whether there are unicast routes
to RP.
■ Use the display pim neighbor command to check whether the neighboring
relationship is correctly established.