Cisco Systems 3560 Manual De Usuario

This example shows how to configure the switch to advertise itself as a candidate RP to the BSR in its 
PIM domain. Standard access list number 4 specifies the group prefix associated with the RP that has 
the address identified by a port. That RP is responsible for the groups with the prefix 239.

Switch(config)# ip pim rp-candidate gigabitethernet0/2 group-list 4

Switch(config)# access-list 4 permit 239.0.0.0 0.255.255.255

If there are only Cisco devices in you network (no routers from other vendors), there is no need to 
configure a BSR. Configure Auto-RP in a network that is running both PIMv1 and PIMv2.

If you have non-Cisco PIMv2 routers that need to interoperate with Cisco PIMv1 routers and multilayer 
switches, both Auto-RP and a BSR are required. We recommend that a Cisco PIMv2 router or multilayer 
switch be both the Auto-RP mapping agent and the BSR.

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 

 and the 

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 
mappings. This procedure is optional. 

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

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).

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 (configured or learned from Auto-RP).

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 group, enter the group address for which to display RP information.