Cisco Systems 3560 Manual De Usuario

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. 

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.

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.

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.

Return to privileged EXEC mode.

Verify your entries.

(Optional) Save your entries in the configuration file.

Verify the Layer 2 Catalyst switch CGMP-client configuration. For more 
information, see the documentation that shipped with the product.