Monitoring The Rp Mapping Information; Troubleshooting Pimv1 And Pimv2 Interoperability Problems - Cisco 3845 - Security Bundle Router Software Manual

Configuring IP Multicast Routing
If you must have one or more BSRs, we have these recommendations:
•
•
Beginning in privileged EXEC mode, follow these steps to verify the consistency of group-to-RP
mappings. This procedure is optional.
Command
Step 1
show ip pim rp [[group-name |
group-address] | mapping]
Step 2
show ip pim rp-hash group

Monitoring the RP Mapping Information

To monitor the RP mapping information, use these commands in privileged EXEC mode:
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•
•

Troubleshooting PIMv1 and PIMv2 Interoperability Problems

When debugging interoperability problems between PIMv1 and PIMv2, check these in the order shown:
1.
2.
Cisco ME 3800X and 3600X Switch Software Configuration Guide
33-32
Configure the candidate BSRs as the RP-mapping agents for Auto-RP. For more information, see
the "Configuring Auto-RP" section on page 33-23
on page 33-29.
For group prefixes advertised through Auto-RP, the PIMv2 BSR mechanism should not advertise a
subrange of these group prefixes served by a different set of RPs. In a mixed PIMv1 and PIMv2
domain, have backup RPs serve the same group prefixes. This prevents the PIMv2 DRs from
selecting a different RP from those PIMv1 DRs, due to the longest match lookup in the RP-mapping
database.
Purpose
On any Cisco device, display the available RP mappings.
• (Optional) For group-name, specify the name of the group about which to
display RPs.
(Optional) For group-address, specify the address of the group about which
•
to display RPs.
(Optional) Use the mapping keyword to display all group-to-RP mappings
•
of which the Cisco device is aware (either configured or learned from
Auto-RP).
On a PIMv2 router or multilayer switch, confirm that the same RP is the one that
a PIMv1 system chooses.
For group, enter the group address for which to display RP information.
show ip pim bsr displays information about the elected BSR.
show ip pim rp-hash group displays the RP that was selected for the specified group.
show ip pim rp [group-name | group-address | mapping] displays how the switch learns of the RP
(through the BSR or the Auto-RP mechanism).
Verify RP mapping with the show ip pim rp-hash privileged EXEC command, making sure that all
systems agree on the same RP for the same group.
Verify interoperability between different versions of DRs and RPs. Make sure the RPs are
interacting with the DRs properly (by responding with register-stops and forwarding decapsulated
data packets from registers).
Chapter 33 Configuring IP Multicast Routing
and the "Configuring Candidate BSRs" section
OL-23400-01