Cisco Systems 3560 Manual Do Utilizador

44-41

Catalyst 3560 Switch Software Configuration Guide

OL-8553-06

Chapter 44 Configuring IP Multicast Routing

Configuring Optional IGMP Features

Beginning in privileged EXEC mode, follow these steps to modify the host-query interval. This
procedure is optional.

To return to the default setting, use the no ip igmp query-interval interface configuration command.

Changing the IGMP Query Timeout for IGMPv2

If you are using IGMPv2, you can specify the period of time before the switch takes over as the querier
for the interface. By default, the switch waits twice the query interval controlled by the ip igmp
query-interval interface configuration command. After that time, if the switch has received no queries,
it becomes the querier.

You can configure the query interval by entering the show ip igmp interface interface-id privileged
EXEC command.

Beginning in privileged EXEC mode, follow these steps to change the IGMP query timeout. This
procedure is optional.

To return to the default setting, use the no ip igmp querier-timeout interface configuration command.

Command

Purpose

Step 1

configure terminal

Enter global configuration mode.

Step 2

interface interface-id

Specify the interface to be configured, and enter interface configuration
mode.

Step 3

ip igmp query-interval seconds

Configure the frequency at which the designated router sends IGMP
host-query messages.

By default, the designated router sends IGMP host-query messages
every 60 seconds to keep the IGMP overhead very low on hosts and
networks. The range is 1 to 65535.

Step 4

end

Return to privileged EXEC mode.

Step 5

show ip igmp interface [interface-id]

Verify your entries.

Step 6

copy running-config startup-config

(Optional) Save your entries in the configuration file.