Troubleshooting Pim; A Multicast Distribution Tree Cannot Be Correctly Built - HP MSR2003 Configuration Manual

(10.110.5.100, 232.1.1.1)
Protocol: pim-ssm, Flag:
UpTime: 00:13:25
Upstream interface: GigabitEthernet2/1/2
Upstream neighbor: 192.168.1.2
RPF prime neighbor: 192.168.1.2
Downstream interface(s) information:
Total number of downstreams: 1
1: GigabitEthernet2/1/1
# Display PIM routing table information 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: GigabitEthernet2/1/1
Upstream neighbor: NULL
RPF prime neighbor: NULL
Downstream interface(s) information:
Total number of downstreams: 1
1: GigabitEthernet2/1/2
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. A multicast distribution tree cannot be correctly built.
Analysis
• On a PIM-DM network, multicast data is flooded from the router that directly connects to the
multicast source to the routers that directly connects to the receivers. When the multicast data is
flooded to a router, the router creates an (S, G) entry only if it has a route to the multicast source. The
router cannot create an (S, G) entry under either of the following conditions:
The router does not have a route to the multicast source.
PIM-DM is not enabled on the RPF interface toward the multicast source.
On a PIM-SM network, when a router wants to join the SPT, the router will create an (S, G) entry.
•
The router cannot create an (S, G) entry under either of the following conditions:
•
The router does not have a route to the multicast source.
PIM-SM is not enabled on the RPF interface toward the multicast source.
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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