3Com Switch 7750 Configuration Guide Guide

438 CHAPTER 44: PIM CONFIGURATION
[SW7750-Vlan-interface10] igmp enable
[SW7750-Vlan-interface10] pim sm
[SW7750-Vlan-interface10] quit
[SW7750] vlan 11
[SW7750-vlan11] port Ethernet 1/0/4 to Ethernet 1/0/5
[SW7750-vlan11] quit
[SW7750] interface Vlan-interface 11
[SW7750-Vlan-interface11] pim sm
[SW7750-Vlan-interface11] quit
[SW7750] vlan 12
[SW7750-vlan12] port Ethernet 1/0/6 to Ethernet 1/0/7
[SW7750-vlan12] quit
[SW7750] interface Vlan-interface 12
[SW7750-Vlan-interface12] pim sm
[SW7750-Vlan-interface12] quit
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.