744
Command Reference for AT-IX5-28GPX High Availability, High Power Video Surveillance PoE Switch
C613-50057-01 REV A
AlliedWare Plus™ Operating System - Version 5.4.5-0.x
IGMP
AND
IGMP S
NOOPING
C
OMMANDS
IP
IGMP
LIMIT
ip igmp limit
Overview
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 addresses 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-li
st-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, IGMP Snooping, or IGMP
Proxy.
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:
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
Parameter
Description
<limitvalue>
<2-512> Maximum number of group
membership entries.
<
access-list-number
>
Access-list number, in the range <1-99>.
<
access-list-number-expanded
>
Access-list number (expanded range), in
the range <1300-1999>.
<
access-list-name
>
Standard IP access-list name.
