HP ProCurve Secure Router 7203 dl Advanced Management And Configuration Manual page 590

Configuring Multicast Support with PIM-SM
Troubleshooting PIM-SM
11-62
Troubleshooting RP Sets. When a router does not receive multicast traffic
from its upstream neighbors, one of the most likely problems is that the local
router and its upstream neighbors have incompatible RP sets. If neighbors
select different RPs for a group, the upstream router ignores joins for that
group from the downstream router.
Follow these steps to troubleshoot a router's RP set:
1. Compare the local router's RP map, in which the router stores the IP
address of the RP for each active group, to its neighbors' maps. Each
router should map each group to the same RP. To view the map, enter this
enable mode command:
ProCurve# show ip pim-sparse rp-map
Figure 11-28 shows how to compare the output from this command on
two routers.
RouterA# show ip pim-sparse rp-map
Number of group-to-RP mappings: 5
Group address
------------------------------------------
224.0.1.22
224.1.1.1
239.255.255.1
239.255.255.10
239.255.255.200
RouterB# show ip pim-sparse rp-map
Number of group-to-RP mappings: 5
Group address
------------------------------------------
224.0.1.22
224.1.1.1
239.255.255.1
239.255.255.10
239.255.255.200
Figure 11-28. Comparing RP Maps
2. If, from router to router, you find discrepancies in the RPs selected, you
should view routers' RP sets to find the source of the discrepancies. On a
ProCurve Secure Router, the RP set is the manually configured pool of
routers that can act as RP for various groups. Every router in the domain
should have exactly the same RP set.
RP address
10.1.1.2
10.1.1.2
10.1.1.2
10.1.1.2
10.1.1.2
The RP for this group is different
on Router A and Router B.
RP address
10.1.1.2
10.1.1.2
10.1.1.1
10.1.1.2
10.1.1.2