Cisco Systems 3750E Configuring a Rendezvous Point, Manually Assigning an RP to Multicast Groups

Chapter 42 Configuring IP Multicast Routing

Configuring IP Multicast Routing

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	interface interface-id	Specify the interface on which you want to enable PIM stub routing, and
		enter interface configuration mode.
		For switches running the IP Base image, the specified interface must be
		an SVI that is a VLAN interface created by using the interface vlan
		vlan-idglobal configuration command. For all other software images, the
		specified interface can be any routed interface.
Step 3
	ip pim passive	Configure the PIM stub feature on the interface.
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 disable PIM stub routing on an interface, use the no ip pim passive interface configuration command.

Configuring a Rendezvous Point

You must have an RP if the interface is in sparse-dense mode and if you want to treat the group as a sparse group. You can use several methods, as described in these sections:

•Manually Assigning an RP to Multicast Groups, page 42-14

•Configuring Auto-RP, page 42-16(a standalone, Cisco-proprietary protocol separate from PIMv1)

•Configuring PIMv2 BSR, page 42-20(a standards track protocol in the Internet Engineering Task Force (IETF)

You can use auto-RP, BSR, or a combination of both, depending on the PIM version that you are running and the types of routers in your network. For more information, see the “PIMv1 and PIMv2 Interoperability” section on page 42-11and the “Auto-RP and BSR Configuration Guidelines” section on page 42-11.

Manually Assigning an RP to Multicast Groups

This section explains how to manually configure an RP. If the RP for a group is learned through a dynamic mechanism (such as auto-RP or BSR), you need not perform this task for that RP.

Senders of multicast traffic announce their existence through register messages received from the source first-hop router (designated router) and forwarded to the RP. Receivers of multicast packets use RPs to join a multicast group by using explicit join messages. RPs are not members of the multicast group; rather, they serve as a meeting place for multicast sources and group members.

You can configure a single RP for multiple groups defined by an access list. If there is no RP configured for a group, the multilayer switch treats the group as dense and uses the dense-mode PIM techniques.

Beginning in privileged EXEC mode, follow these steps to manually configure the address of the RP. This procedure is optional.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
42-14	OL-9775-02