HP 7102dl - ProCurve Secure Router Configuration Manual page 703

Enter this command from the CLI of the router that is using the wrong RP
to view its RP set:
ProCurve# show ip pim-sparse rp-set
Compare this RP set to that configured on a neighboring router that has
selected the correct RP.
Figure 13-29 shows RP sets on two neighboring routers in a PIM domain.
Administrators in this domain have decided that all RPs should potentially
support all multicast groups. In this example, Router A was unable to join
the RP tree for group 239.255.255.1 because its RP set did not include the
address for one of the routers capable of acting as RP.
RouterA# show ip pim-sparse rp-set
Group address Static-RP-address
-----------------------------------
224.0.0.0 /4
RouterB# show ip pim-sparse rp-set
Group address Static-RP-address
-----------------------------------
224.0.0.0 /4
224.0.0.0 /4
Figure 13-29. Viewing an RP Set
3. Comparing RP sets becomes more complicated when RPs have been
configured to support specific groups. If possible, you should view the RP
set and the ACLs indicated in that set at the same time (as shown in Figure
13-30). You can then determine which groups each RP supports.
Configuring Multicast Support with PIM-SM
10.1.1.2
10.1.1.1
10.1.1.2
Troubleshooting PIM-SM
Entry missing on Router A
13-63