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Catalyst 3750-E and 3560-E Switch Software Configuration Guide
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Chapter 46 Configuring IP Multicast Routing
Configuring IP Multicast Routing
If you must have one or more BSRs, we have these recommendations:
• Configure the candidate BSRs as the RP-mapping agents for Auto-RP. For more information, see
the “Configuring Auto-RP” section on page 46-25 and the “Configuring Candidate BSRs” section
on page 46-31.
• 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.
Beginning in privileged EXEC mode, follow these steps to verify the consistency of group-to-RP
ma
ppings. This procedure is optional.
Command Purpose
Step 1
show ip pim rp [[group-name |
group-address] | mapping]
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).
Step 2
show ip pim rp-hash group On a PIMv2 router or multilayer switch, confirm that the same RP is the one that
a PIMv1 system chooses.
For gr
oup, enter the group address for which to display RP information.
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