Pim Troubleshooting - 3Com 3C13636 Configuration Manual

3Com Router 3000 Ethernet Family
Configuration Guide
On Multicast Source associate multicast programs with multicast addresses, for
example, Movie Online with 224.0.1.1.
After you configure the boundary on interface Serial4/0/0, Router D can no longer
receive BSR information from Router B as being excluded from the IPM domain.
Suppose Host A is a receiver of the Movie Online program and Multicast Source sends
data with the destination address of 224.0.1.1. In the beginning, Router A receives the
data through Router B. When the rate of multicast data exceeds 10 kbps, Router A joins
the shortest path tree and directly receives data through Router C.

4.6 PIM Troubleshooting

Fault 1: The router fails to establish the multicast routing table.
Troubleshooting: Follow the steps below:
Make sure that the unicast routes are correct before settling to the problem.
PIM-SM requires support from the RP and the BSR. Use the display pim bsr-info
command to check for BSR information. If none, check for the unicast routes
towards the BSR. Then use the display pim rp-info command to check for RP
information. If none, also check the unicast routes.
Use the display pim neighbor command to check whether the neighbor
relationship has been established correctly.
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Chapter 4 PIM Configuration