Cisco Systems 3750E manual Ip pim bsr-candidate interface-id, Hash-mask-length priority, 42-22

Chapter 42 Configuring IP Multicast Routing

Configuring IP Multicast Routing

This example shows a portion of an IP multicast boundary configuration that denies Auto-RP information:

Switch(config)# access-list 1 deny 224.0.1.39

Switch(config)# access-list 1 deny 224.0.1.40

Switch(config)# access-list 1 permit all

Switch(config)# interface gigabitethernet1/0/1

Switch(config-if)#ip multicast boundary 1

Configuring Candidate BSRs

You can configure one or more candidate BSRs. The devices serving as candidate BSRs should have good connectivity to other devices and be in the backbone portion of the network.

Beginning in privileged EXEC mode, follow these steps to configure your switch as a candidate BSR. This procedure is optional.

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	ip pim bsr-candidate interface-id	Configure your switch to be a candidate BSR.
	hash-mask-length [priority]	• For interface-id,enter the interface on this switch from which the
		BSR address is derived to make it a candidate. This interface must
		be enabled with PIM. Valid interfaces include physical ports, port
		channels, and VLANs.
		• For hash-mask-length, specify the mask length (32 bits maximum)
		that is to be ANDed with the group address before the hash function
		is called. All groups with the same seed hash correspond to the same
		RP. For example, if this value is 24, only the first 24 bits of the group
		addresses matter.
		• (Optional) For priority, enter a number from 0 to 255. The BSR with
		the larger priority is preferred. If the priority values are the same,
		the device with the highest IP address is selected as the BSR. The
		default is 0.
Step 3
	end	Return to privileged EXEC mode.
Step 4
	show running-config	Verify your entries.
Step 5
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

To remove this device as a candidate BSR, use the no ip pim bsr-candidateglobal configuration command.

This example shows how to configure a candidate BSR, which uses the IP address 172.21.24.18 on a port as the advertised BSR address, uses 30 bits as the hash-mask-length, and has a priority of 10.

Switch(config)# interface gigabitethernet1/0/2

Switch(config-if)#ip address 172.21.24.18 255.255.255.0

Switch(config-if)#ip pim sparse-dense-mode

Switch(config-if)#ip pim bsr-candidate gigabitethernet1/0/2 30 10

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
42-22	OL-9775-02