Configuring Optional IGMP Features
Configuring the Switch as a Member of a Group
You can configure the switch as a member of a multicast group and discover 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 of 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 software.
Performing this procedure might impact the CPU performance because the CPU will receive all data traffic
for the group address.
Caution
This procedure is optional.
SUMMARY STEPS
1.
configure terminal
2.
interface interface-id
3.
ip igmp join-group group-address
4.
end
5.
show ip igmp interface [interface-id]
6.
copy running-config startup-config
DETAILED STEPS
PurposeCommand or Action
Enters the global configuration mode.configure terminal
Example:
Switch# configure terminal
Step 1
Specifies the interface on which you want to enable multicast
routing, and enters interface configuration mode.
interface interface-id
Example:
Switch(config)# interface
Step 2
gigabitethernet 1/0/1
Configures the switch to join a multicast group.
ip igmp join-group group-address
Step 3
Example:
Switch(config-if)# ip igmp
By default, no group memberships are defined.
For group-address, specify the multicast IP address in dotted
decimal notation.
Catalyst 2960-XR Switch IP Multicast Routing Configuration Guide, Cisco IOS Release 15.0(2)EX1
16 OL-29426-01
Understanding Cisco's Implementation of IP Multicast Routing
Configuring Optional IGMP Features
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