Cisco Systems 3750E manual Configuring PIMv2 BSR, Ip pim bsr-border, 42-20

Chapter 42 Configuring IP Multicast Routing

Configuring IP Multicast Routing

In this example, the mapping agent accepts candidate RP announcements from only two devices,

172.16.5.1and 172.16.2.1. The mapping agent accepts candidate RP announcements from these two devices only for multicast groups that fall in the group range of 224.0.0.0 to 239.255.255.255. The mapping agent does not accept candidate RP announcements from any other devices in the network. Furthermore, the mapping agent does not accept candidate RP announcements from 172.16.5.1

or 172.16.2.1 if the announcements are for any groups in the 239.0.0.0 through 239.255.255.255 range. This range is the administratively scoped address range.

Configuring PIMv2 BSR

These sections describe how to set up BSR in your PIMv2 network:

•Defining the PIM Domain Border, page 42-20(optional)

•Defining the IP Multicast Boundary, page 42-21(optional)

•Configuring Candidate BSRs, page 42-22(optional)

•Configuring Candidate RPs, page 42-23(optional)

For overview information, see the “Bootstrap Router” section on page 42-7.

Defining the PIM Domain Border

As IP multicast becomes more widespread, the chance of one PIMv2 domain bordering another PIMv2 domain is increasing. Because these two domains probably do not share the same set of RPs, BSR, candidate RPs, and candidate BSRs, you need to constrain PIMv2 BSR messages from flowing into or out of the domain. Allowing these messages to leak across the domain borders could adversely affect the normal BSR election mechanism and elect a single BSR across all bordering domains and co-mingle candidate RP advertisements, resulting in the election of RPs in the wrong domain.

Beginning in privileged EXEC mode, follow these steps to define the PIM domain border. This procedure is optional.

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	interface interface-id	Specify the interface to be configured, and enter interface configuration
		mode.
Step 3
	ip pim bsr-border	Define a PIM bootstrap message boundary for the PIM domain.
		Enter this command on each interface that connects to other bordering
		PIM domains. This command instructs the switch to neither send or
		receive PIMv2 BSR messages on this interface as shown in Figure 42-4.
Step 4
	end	Return to privileged EXEC mode.
Step 5
	show running-config	Verify your entries.
Step 6
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

To remove the PIM border, use the no ip pim bsr-borderinterface configuration command.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
42-20	OL-9775-02