Ip igmp query-holdtime, Command can be – Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) User Manual
Page 751
IGMP Snooping Commands
Software Reference for x310 Series Switches
C613-50046-01 REV A
AlliedWare Plus
TM
Operating System - Version 5.4.4C
31.13
ip igmp query-holdtime
This command sets the time that an IGMP Querier waits after receiving a query solicitation
before it sends an IGMP Query. IGMP General Query messages will not be sent during the
hold time interval.
Use the no variant of this command to return to the default query hold time period.
Syntax
ip igmp query-holdtime <interval>
no ip igmp query-holdtime
Default
By default the delay before sending IGMP General Query messages is 500 milliseconds.
Mode
Interface Configuration for a VLAN interface.
Usage
Use this command to configure a value for the IGMP query hold time in the current
network. IGMP Queries can be generated after receiving Query Solicitation (QS) packets
and there is a possibility of a DoS (Denial of Service) attack if a stream of Query Solicitation
(QS) packets are sent to the IGMP Querier, eliciting a rapid stream of IGMP Queries. This
command applies to interfaces on which the switch is acting as an IGMP Querier.
Use the
command when a delay for IGMP general query
messages is required and IGMP general query messages are required. The ip igmp query-
holdtime command stops IGMP query messages during the configured holdtime interval,
so the rate of IGMP Queries that can be sent out of an interface can be restricted.
See
“Query Solicitation” on page 30.8
for introductory information about the Query
Solicitation feature.
Ensure your VLAN is configured first: see
Examples
To set the IGMP query holdtime to 900 ms for vlan20, use the following commands:
To reset the IGMP query holdtime to the default (500 ms) for vlan10, use the following
commands:
Parameter
Description
<interval>
Query interval value in milliseconds, in the range <100-5000>.
Note
This command will function on your switch in the stand-alone mode. but is not
supported when the switch forms part of a VCS Stack.
awplus#
configure terminal
awplus(config)#
interface vlan20
awplus(config-if)#
ip igmp query-holdtime 900
awplus#
configure terminal
awplus(config)#
interface vlan10
awplus(config-if)#
no ip igmp query-holdtime