Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide Chapter 2 IGMP Configuration Commands
3Com Corporation
2-7
View
Interface view
Parameter
group-address: Multicast address of the multicast group that an interface will join.
Description
Use the igmp host-join command to enable an interface of a router to join a multicast
group.
Use the undo igmp host-join command to disable the configuration.
By default, an interface does not join any multicast group.
On one router, up to 1024 interfaces can be configured with igmp host-join command
at best.
Related command: igmp group-policy.
Example
# Configure Ethernet1/0/0 to join the multicast group 255.0.0.1.
[3Com-Ethernet1/0/0] igmp host-join 225.0.0.1
2.1.9 igmp lastmember-queryinterval
Syntax
igmp lastmember-queryinterval seconds
undo igmp lastmember-queryinterval
View
Interface view
Parameter
seconds: Interval at which IGMP querier sends the IGMP specified group query packet
when it receives IGMP Leave packet from the host, in second. The value ranges from 1
to 5 seconds. By default, the value is 1 second.
Description
Use the igmp lastmember-queryinterval command to set the interval at which IGMP
querier sends the IGMP specified group query packet when it receives IGMP Leave
packet from the host.
Use the undo igmp lastmember-queryinterval command to restore the default value.
On a shared network, that is, when there are multiple hosts and multicast routers on a
network segment, the query router (querier for short) takes charge of maintaining IGMP