3Com 3031 Command Reference Manual page 701

IGMP Configuration Commands 701
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
Using the igmp group-limit command, you can 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. Using the undo igmp group-limit command,
you can 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
igmp group-policy Syntax
igmp group-policy acl-number [ 1 | 2 ]
undo igmp group-policy
View
Interface view
Parameter
acl-number: Number of basic IP ACL, defining the range of a multicast group. The
value ranges from 1 to 99.
1: IGMP Version 1.
2: IGMP Version 2. If IGMP version is not specified, IGMP Version 2 is used by
default.
Description
Using the igmp group-policy command, you can set the filter of multicast groups
on an interface to control the accessing to the IP multicast groups. Using the undo
igmp group-policy command, you can remove the filter configured.
By default, no filter is configured, that is, a host can join any multicast group.
If you do not want the hosts on the network that the interface is on to join some
multicast groups and receive the packets from the multicast groups, you can use
this command to limit the range of the multicast groups served by the interface.