Cisco Systems 3750E manual Configuring sdr Listener Support, Ip cgmp proxy, 42-35

Chapter 42 Configuring IP Multicast Routing

Configuring Optional Multicast Routing Features

	Command	Purpose
Step 3
	ip cgmp [proxy]	Enable CGMP on the interface.
		By default, CGMP is disabled on all interfaces.
		Enabling CGMP triggers a CGMP join message. Enable CGMP only on
		Layer 3 interfaces connected to Layer 2 Catalyst switches.
		(Optional) When you enter the proxy keyword, the CGMP proxy function
		is enabled. The proxy router advertises the existence of
		non-CGMP-capable routers by sending a CGMP join message with the
		non-CGMP-capable router MAC address and a group address
		of 0000.0000.0000.
		Note To perform CGMP proxy, the switch must be the IGMP querier. If
		you configure the ip cgmp proxy command, you must manipulate
		the IP addresses so that the switch is the IGMP querier, which
		might be the highest or lowest IP address, depending on which
		version of IGMP is running on the network. An IGMP Version 2
		querier is selected based on the lowest IP address on the interface.
		An IGMP Version 1 querier is selected based on the multicast
		routing protocol used 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.
Step 7
		Verify the Layer 2 Catalyst switch CGMP-client configuration. For more
		information, see the documentation that shipped with the product.

To disable CGMP on the interface, use the no ip cgmp interface configuration command.

When multiple Cisco CGMP-capable devices are connected to a switched network and the ip cgmp proxy command is needed, we recommend that all devices be configured with the same CGMP option and have precedence for becoming the IGMP querier over non-Cisco routers.

Configuring sdr Listener Support

The MBONE is the small subset of Internet routers and hosts that are interconnected and capable of forwarding IP multicast traffic. Other multimedia content is often broadcast over the MBONE. Before you can join a multimedia session, you need to know what multicast group address and port are being used for the session, when the session is going to be active, and what sort of applications (audio, video, and so forth) are required on your workstation. The MBONE Session Directory Version 2 (sdr) tool provides this information. This freeware application can be downloaded from several sites on the World Wide Web, one of which is http://www.video.ja.net/mice/index.html.

SDR is a multicast application that listens to a well-known multicast group address and port for Session Announcement Protocol (SAP) multicast packets from SAP clients, which announce their conference sessions. These SAP packets contain a session description, the time the session is active, its IP multicast group addresses, media format, contact person, and other information about the advertised multimedia session. The information in the SAP packet is displayed in the SDR Session Announcement window.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02		42-35