Configuring The Multilayer Switch As A Member Of A Group - Cisco Catalyst 3550 series Software Configuration Manual

Configuring Optional IGMP Features

Configuring the Multilayer Switch as a Member of a Group

Multilayer switches can be configured as members of a multicast group. This is useful to determine
multicast reachability in a network. If all the multicast-capable routers and multilayer switches that you
administer are members of a multicast group, pinging that group causes all these devices to respond. The
devices respond to ICMP echo-request packets addressed to a group of which they are members. Another
example is the multicast trace-route tools provided in the Cisco IOS software.
Beginning in privileged EXEC mode, follow these steps to configure the multilayer switch to be a
member of a group:
Command
Step 1
configure terminal
Step 2 interface interface-id
Step 3 ip igmp join-group group-address
Step 4
end
Step 5
show ip igmp interface [interface-id]
Step 6 copy running-config startup-config
To cancel membership in a group, use the no ip igmp join-group group-address interface configuration
command.
This example shows how to allow the switch to join multicast group 255.2.2.2:
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# ip igmp join-group 255.2.2.2
Catalyst 3550 Multilayer Switch Software Configuration Guide
34-34
Purpose
Enter global configuration mode.
Enter interface configuration mode, and specify the interface to be
configured.
Configure the switch to join a multicast group.
By default, no group memberships are defined.
For group-address, specify the multicast IP address in dotted decimal
notation.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Chapter 34 Configuring IP Multicast Routing
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