Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide Chapter 2 IGMP Configuration Commands
3Com Corporation
2-5
Use the undo igmp enable command to disable IGMP on an interface.
By default, IGMP is disabled on an interface.
Only after multicast is enabled, can this command take effect. After this command is
configured, the configuration of other attributes of IGMP can be performed.
Related command: multicast routing-enable.
Example
# Enable IGMP on interface Ethernet0/0/0.
[3Com-Ethernet0/0/0] igmp enable
2.1.6 igmp group-limit
Syntax
igmp group-limit limit
undo igmp group-limit
View
Interface view
Parameter
limit: Number of IGMP groups, ranging from 0 to MAX_IF_IGMP_GROUP_LIMIT. The
value of MAX_IF_IGMP_GROUP_LIMIT on routers is MAX_MROUTE_LIMIT, which
differs with the different router types.
Description
Use the igmp group-limit command to limit the number of IGMP groups joined on the
interface. If the number exceeds the limit, the router will not process the joined IGMP
packet any more.
Use the undo igmp group-limit command to restore the default configuration.
By default, the maximum number of IGMP groups joined on the interface is 1024.
If the number of IGMP groups joined on the interface has exceeded the configuration
value during configuration, the previously joined IGMP groups will not be deleted.
If this command is executed repeatedly, the new configuration will overwrite the
previous one.
Example
# Limit the maximum number of IGMP groups joined on the interface Ethernet1/0/0 to
100.
[3Com-Ethernet1/0/0] igmp group-limit 100