Configuring IGMP
Fixed Switch Configuration Guide 19-17
Basic IGMP Configuration
Procedure 19-1 describes the basic steps to configure Layer 2 IGMP snooping on Enterasys
stackable and standalone devices. This procedure assumes that the VLANs on which IGMP will
run have been configured and enabled with IP interfaces.
Procedure 19-2 describes the basic steps to configure Layer 3 IGMP querying on fixed switch
platforms that support basic routing. This procedure assumes that the VLANs on which IGMP
will run have been configured and enabled with IP interfaces.
For more information on IGMP CLI commands, refer to your device’s CLI Reference as applicable.
Example IGMP Configuration on Layer 3
System(su)->router
System(su)->router>enable
System(su)->router#configure
Enter configuration commands:
System(su)->router(Config)#ip igmp
System(su)->router(Config)#interface vlan 1
System(su)->router(Config-if(Vlan 1))#ip igmp enable
Set the maximum response time being inserted into
group-specific queries sent in response to leave
group messages. Use the no command to reset the
IGMP last member query interval to the default value
of 1 second.
ip igmp last-member-query-interval time
no ip igmp last-member-query-interval
Set the number of group-specific queries sent before
assuming there are no local members. Use the no
command to reset the IGMP last member query
count to the default value of 2.
ip igmp last-member-query-count count
no ip igmp last-member-query-count
Configure the robustness tuning for expected packet
loss on an IGMP routing interface. Use the no
command to reset the IGMP robustness value to the
default of 2.
ip igmp robustness robustness
no ip igmp robustness
Table 19-4 Layer 3 IGMP Configuration Commands
Task Command
Procedure 19-1 Basic IGMP Snooping Configuration
Step Task Command
1. In switch mode, enable IGMP globally. set igmpsnooping adminmode enable
2. In switch mode, enable IGMP on each of the VLAN
ports.
set igmpsnooping interfacemode port-
string enable
Procedure 19-2 Basic IGMP Configuration in Router Mode
Step Task Command
1. In router configuration mode, enable IGMP globally. ip igmp
2. In router configuration mode, enable IGMP on each
VLAN interface that will be required to determine
host membership on directly attached subnets.
ip igmp enable
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