Cisco WS-C3560G-24PS-E Software Configuration Guide - Page 728
Enabling CGMP Server Support, Verify the Layer 2 Catalyst switch CGMP-client configuration. For more
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Page 728 highlights
Configuring Optional Multicast Routing Features Chapter 32 Configuring IP Multicast Routing Enabling CGMP Server Support The switch serves as a CGMP server for devices that do not support IGMP snooping but have CGMP client functionality. CGMP is a protocol used on Cisco routers and multilayer switches connected to Layer 2 Catalyst switches to perform tasks similar to those performed by IGMP. CGMP is necessary because the Layer 2 switch cannot distinguish between IP multicast data packets and IGMP report messages, which are both at the MAC-level and are addressed to the same group address. Beginning in privileged EXEC mode, follow these steps to enable the CGMP server on the switch interface. This procedure is optional. Step 1 Step 2 Command configure terminal interface interface-id Step 3 ip cgmp [proxy] Step 4 Step 5 Step 6 Step 7 end show running-config copy running-config startup-config Purpose Enter global configuration mode. Specify the interface that is connected to the Layer 2 Catalyst switch, and enter interface configuration mode. 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. 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, refer to 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. 32-32 Catalyst 3560 Switch Software Configuration Guide 78-16156-01
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