Command:

ip cgmp


Mode:

Router(config-if)#

Syntax:

ip cgmp[proxy]

no ip cgmp


Syntax Description:

proxy

(Optional) Enables CGMP and the CGMP proxy function.


Command Description:

To enable Cisco Group Management Protocol (CGMP) on an interface of a router connected to a Catalyst 5000 switch, use the ip cgmp interface configuration command. To disable CGMP routing, use the no form of this command. By default CGMP is disabled.

Usage Guidelines: 

When enabled on an interface, this command triggers a CGMP Join message. When a no ip cgmp command is issued, a triggered CGMP Leave message is sent for the routers MAC address on the interface for group 0000.0000.0000 (all groups). CGMP can run on an interface only if Protocol Independent Multicast (PIM) is configured on the same interface.

When the proxy keyword is specified, the CGMP proxy function is also enabled. That is, any router that is not CGMP-capable will be advertised by the proxy router. The proxy router advertises the existence of other non CGMP-capable routers by sending a CGMP Join message with the non-CGMP-capable router's MAC address and a group address of 0000.0000.0000. To perform CGMP proxy, a Cisco router must be the IGMP querier. If you configure ip cgmp proxy, you must manipulate the IP addresses so that a Cisco router will be the IGMP querier, which might be the highest or lowest IP address, depending on which version of IGMP is being run on the network.

When multiple Cisco routers are connected to a switched network and ip cgmp [proxy] is needed, it is recommended that all of them be configured:

Example:

The following example enables CGMP:       

Router(config-if)#ip cgmp   

The following example enables CGMP and CGMP proxy: 

Router(config-if)#ip cgmp proxy
Misconceptions:
None


Related Commands:

None

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