Cisco Systems 3750E manual Ip multicast boundary, 42-21

Chapter 42 Configuring IP Multicast Routing

Configuring IP Multicast Routing

Figure 42-4 Constraining PIMv2 BSR Messages

		PIMv2 sparse-mode
Configure the		network			Configure the
ip pim bsr-border				ip pim bsr-border
command on		BSR	BSR		command on
this interface.		messages	messages		this interface.
Neighboring					Neighboring
	Layer 3		Layer 3
PIMv2 domain		BSR			PIMv2 domain
	switch		switch

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Defining the IP Multicast Boundary

You define a multicast boundary to prevent Auto-RP messages from entering the PIM domain. You create an access list to deny packets destined for 224.0.1.39 and 224.0.1.40, which carry Auto-RP information.

Beginning in privileged EXEC mode, follow these steps to define a multicast boundary. This procedure is optional.

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	access-listaccess-list-number deny	Create a standard access list, repeating the command as many times as
	source [source-wildcard]	necessary.
		• For access-list-number, the range is 1 to 99.
		• The deny keyword denies access if the conditions are matched.
		• For source, enter multicast addresses 224.0.1.39 and 224.0.1.40,
		which carry Auto-RP information.
		• (Optional) For source-wildcard, enter the wildcard bits in dotted
		decimal notation to be applied to the source. Place ones in the bit
		positions that you want to ignore.
		Recall that the access list is always terminated by an implicit deny
		statement for everything.
Step 3
	interface interface-id	Specify the interface to be configured, and enter interface configuration
		mode.
Step 4
	ip multicast boundary	Configure the boundary, specifying the access list you created in Step 2.
	access-list-number
Step 5
	end	Return to privileged EXEC mode.
Step 6
	show running-config	Verify your entries.
Step 7
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

To remove the boundary, use the no ip multicast boundary interface configuration command.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02		42-21