Troubleshooting Pim; A Multicast Distribution Tree Cannot Be Correctly Built - HP MSR1002-4 Configuration Manual

# Display PIM routing entries on Router D.
[RouterD] display pim routing-table
Total 0 (*, G) entry; 1 (S, G) entry
(10.110.5.100, 232.1.1.1)
Protocol: pim-ssm, Flag: LOC
UpTime: 00:12:05
Upstream interface: GigabitEthernet1/0/1
Upstream neighbor: NULL
RPF prime neighbor: NULL
Downstream interface(s) information:
Total number of downstreams: 1
1: GigabitEthernet1/0/2
The output shows that routers on the SPT path (Router A and Router D) have generated the correct
(S, G) entries.

Troubleshooting PIM

A multicast distribution tree cannot be correctly built

Symptom
No multicast forwarding entries are established on the routers (including routers directly connected
with multicast sources or receivers) in a PIM network. This means that a multicast distribution tree
cannot be correctly built.
Solution
To resolve the problem:
1. Use display ip routing-table to verify that a unicast route to the multicast source or the RP is
available.
2. Use display pim interface to verify PIM information on each interface, especially on the RPF
interface. If PIM is not enabled on the interfaces, use pim dm or pim sm to enable PIM-DM or
PIM-SM for the interfaces.
3. Use display pim neighbor to verify that the RPF neighbor is a PIM neighbor.
4. Verify that PIM and IGMP are enabled on the interfaces that directly connect to the multicast
sources or the receivers.
5. Use display pim interface verbose to verify that the same PIM mode is enabled on the RPF
interface on a router and the connected interface of the router's RPF neighbor.
6. Use display current-configuration to verify that the same PIM mode is enabled on all routers.
For PIM-SM, verify that the BSR and C-RPs are correctly configured.
7. If the problem persists, contact Hewlett Packard Enterprise Support.
Protocol: igmp, UpTime: 00:13:25, Expires: 00:03:25
Protocol: pim-ssm, UpTime: 00:12:05, Expires: 00:03:25
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