DETAILED STEPS
PurposeCommand or Action
Enters global configuration mode.configure terminal
Example:
Switch# configure terminal
Step 1
Specifies the interface that is connected to the Layer 2 Catalyst switch, and
enters interface configuration mode.
interface interface-id
Example:
Switch(config)# interface
Step 2
gigabitethernet 1/0/1
Enables CGMP on the interface.ip cgmp [proxy | router-only]
Step 3
Example:
Switch(config-if)# ip cgmp proxy
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.
Note
To disable CGMP on the interface, use the no ip cgmp interface
configuration command.
Note
Returns to privileged EXEC mode.end
Example:
Switch(config-if)# end
Step 4
Verifies your entries.show running-config
Example:
Switch# show running-config
Step 5
(Optional) Saves your entries in the configuration file.copy running-config startup-config
Step 6
Catalyst 2960-XR Switch IP Multicast Routing Configuration Guide, Cisco IOS Release 15.0(2)EX1
OL-29426-01 31
Configuring CGMP
Enabling CGMP Server Support
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