Cisco Systems 78-11741-02 manual Configuring Candidate BSRs, Configuring Candidate RPs, IPC-420

Configuring IP Multicast Routing

Configuring PIM Version 2

To prevent BSR messages from being sent or received through an interface, use the following command in interface configuration mode:

Command	Purpose
Router(config-if)# ip pim bsr-border	Prevents BSR messages from being sent or received through an
	interface.

To prevent Auto-RP messages from being sent or received through an interface, use the following commands beginning in global configuration mode. The access list denies packets destined for the

224.0.1.39and 224.0.1.40 multicast groups. These two groups are specifically assigned to carry Auto-RP information.

	Command	Purpose
Step 1
	Router(config)# access-list	Defines an administratively scoped boundary.
	access-list-number {deny permit} source
	[source-wildcard]
Step 2
	Router(config-if)#ip multicast boundary	Prevents Auto-RP messages (used in PIM Version 1) from being
	access-list	sent or received through an interface.

Configuring Candidate BSRs

Configure one or more candidate BSRs. The routers to serve as candidate BSRs should be well connected and be in the backbone portion of the network, as opposed to the dialup portion of the network.

Note The Cisco IOS implementation of PIM BSR uses the value 0 as the default priority for candidate RPs and BSRs. This implementation predates the draft-ietf-pim-sm-bsr IETF draft, the first IETF draft to specify 192 as the default priority value. The Cisco IOS implementation, thus, deviates from the IETF draft. To comply with the default priority value specified in the draft, you must explicitly set the priority value to 192.

To configure a router to be a candidate BSR, use the following command in global configuration mode:

Command	Purpose
Router(config)# ip pim bsr-candidate type number	Configures the router to be a candidate BSR.
hash-mask-length [priority]

Configuring Candidate RPs

Configure one or more candidate RPs. Similar to BSRs, the RPs should also be well connected and in the backbone portion of the network. An RP can serve the entire IP multicast address space or a portion of it. Candidate RPs send candidate RP advertisements to the BSR.

Cisco IOS IP Configuration Guide

IPC-420