Using Auto-Rp And A Bsr - Cisco WS-C3560-48PS-S Software Configuration Manual

Chapter 32 Configuring IP Multicast Routing
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

Using Auto-RP and a BSR

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:
•
•
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
78-16156-01
Configure the candidate BSRs as the RP-mapping agents for Auto-RP. For more information, see
the "Configuring Auto-RP" section on page 32-13
on page 32-19.
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.
Configuring IP Multicast Routing
and the "Configuring Candidate BSRs" section
Catalyst 3560 Switch Software Configuration Guide
32-21