C613-50170-01 Rev B
Command Reference for x510 Series
1208
AlliedWare Plus™ Operating System - Version 5.4.7-1.x
IGMP
AND
IGMP S
NOOPING
C
OMMANDS
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
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
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.
NOTE
:
This command will function on the switch in the stand-alone mode, but it is not
supported when the device forms part of a VCS Stack.
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
Parameter
Description
<
interval
>
Query interval value in milliseconds, in the range <100-5000>.
