Allied Telesis IE340 Series User Manual

C613-50631-01 Rev A Command Reference for IE340 Series 1667
AlliedWare Plus™ Operating System - Version 5.5.3-0.x
IGMP AND IGMP SNOOPING COMMANDS
IP
IGMP QUERY-HOLDTIME
ip igmp query-holdtime
Overview 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 notes 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 device
is acting as an IGMP Querier.
Use the ip igmp query-interval 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 the IGMP Feature Overview and Configuration Guide for introductory
information about the Query Solicitation feature.
Examples To set the IGMP query holdtime to 900 ms for vlan20, use the following commands:
awplus# configure terminal
awplus(config)# interface vlan20
awplus(config-if)# ip igmp query-holdtime 900
To reset the IGMP query holdtime to the default (500 ms) for vlan10, use the
following commands:
awplus# configure terminal
awplus(config)# interface vlan10
awplus(config-if)# no ip igmp query-holdtime
Parameter Description
<interval> Query interval value in milliseconds, in the range <100-5000>.

Allied Telesis IE340 Series Specifications

General

Brand	Allied Telesis
Model	IE340 Series
Category	Switch
Language	English