Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 749)

IGMP Snooping Commands
Software Reference for x310 Series Switches
C613-50046-01 REV A AlliedWare Plus TM Operating System - Version 5.4.4C 31.11
ip igmp limit
Use this command to configure the limit on the maximum number of group membership
entries for the device as a whole or for the specified interface (if in interface mode). Once
the specified number of group memberships is reached, all further membership reports
will be ignored. Optionally, you can configure an access-list to stop certain address(es)
from being subject to the limit.
The limit is dependent on the MTU (Maximum Transmission Unit) of the interface, which is
the size in bytes of the largest packet that a network protocol can transmit. Typically for an
Ethernet channel with an MTU of 1500 the igmp group membership limit will be 183
groups, because each igmp group membership is 8 bytes.
Use the no variant of this command to unset the limit and any specified exception access-
list.
Syntax ip igmp limit <limitvalue> [except {<access-list-number>|<access-
list-number-expanded>|<access-list-name>}]
no ip igmp limit
Default The default limit, which is reset by the no variant of this command, is the same as
maximum number of group membership entries that can be learned with the ip igmp
limit command.
The default limit of group membership entries that can be learned is 512 entries.
Mode Global Configuration and Interface Configuration for a VLAN interface.
Usage This command applies to interfaces configured for IGMP or IGMP Snooping.
Examples The following example configures an IGMP limit of 100 group membership entries across
all interfaces on which IGMP is enabled, and excludes group 224.1.1.1 from this
limitation:
The following example configures an IGMP limit of 100 group membership entries on
VLAN interface vlan2:
awplus# configure terminal
awplus(config)# access-list 1 permit 224.1.1.1 0.0.0.0
awplus(config)# ip igmp limit 100 except 1
awplus# configure terminal
awplus(config)# interface vlan2
awplus(config-if)# ip igmp limit 100