Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide Chapter 2 IGMP Configuration Commands
3Com Corporation
2-8
group membership on an interface. When the host in IGMP Version 2 leaves a group,
the host should send IGMP Leave packet. If IGMP querier receives the packet, it must
send the IGMP specified group query packet for robust-value times according to the
interval seconds configured via igmp lastmember-queryinterval command (if the
command is not configured, seconds is 1) and the robust coefficient robust-value
configured via igmp robust-count (if the command is not configured, robust-value is 2).
If another host receives the IGMP specified group query packet from IGMP querier and
is interested in the group, it will send IGMP Membership Report packet within the
maximum response time regulated by the packet. If IGMP querier receives IGMP
Membership Report packet from another host within the time robust-value x seconds, it
will go on maintaining the group membership. If not, it will regard the group is timeout
and stop maintaining the group membership.
The command is only valid when IGMP query router is running in IGMP Version 2. If the
host runs in IGMP Version 1, it may not send IGMP Leave packet when it leaves a
group. At that time, the command is invalid to the host.
Related command: igmp robust-count and display igmp interface.
Example
# Configure the query interval of the querier for the last group member on the interface
Ethernet1/0/0 to 3 seconds.
[3Com-Ethernet1/0/0] igmp lastmember-queryinterval 3
2.1.10 igmp max-response-time
Syntax
igmp max-response-time seconds
undo igmp max-response-time
View
Interface view
Parameter
seconds: The maximum response time in the IGMP query packet in second, ranging
from 1 to 25. By default, the value is 10 seconds.
Description
Use the igmp max-response-time command to configure the maximum response
time contained in the IGMP query packet.
Use the undo igmp max-response-time command to restore the default value.
The maximum query response time determines the period for a router to detect quickly
that there are no longer directly connected group members in a LAN.