Cisco Catalyst 4500 Series Command Reference Guide

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
ip igmp query-interval
ip igmp query-interval
To configure the frequency that the switch sends the IGMP host-query messages, use the ip igmp
query-interval command. To return to the default frequency, use the no form of this command.
ip igmp query-interval seconds
no ip igmp query-interval
Syntax Description
Defaults The query interval is set to 60 seconds.
Command Modes Interface configuration mode
Command History
Usage Guidelines If you use the default IGMP snooping configuration, the valid query interval values are from 1 to
65535 seconds. If you have changed the default configuration to support CGMP as the IGMP snooping
learning method, the valid query interval values are from 1 to 300 seconds.
The designated switch for a LAN is the only switch that sends the IGMP host-query messages. For IGMP
version 1, the designated switch is elected according to the multicast routing protocol that runs on the
LAN. For IGMP version 2, the designated querier is the lowest IP-addressed multicast switch on the
subnet.
If no queries are heard for the timeout period (controlled by the ip igmp query-timeout command), the
switch becomes the querier.
Note Changing the timeout period may severely impact multicast forwarding.
Examples This example shows how to change the frequency at which the designated switch sends the IGMP
host-query messages:
Switch(config-if)# ip igmp query-interval 120
Switch(config-if)#
Related Commands
seconds Frequency, in seconds, at which the IGMP host-query messages are transmitted; valid
values depend on the IGMP snooping mode. See the “Usage Guidelines” section for more
information.
Release Modification
12.1(8a)EW Support for this command was introduced on the Catalyst 4500 series switch.

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E