Changing The Igmp Version; Changing The Igmp Query Timeout For Igmpv2 - Cisco WS-C3550-12G Software Configuration Manual
Multilayer switch
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Configuring Optional IGMP Features
Table 24-2 Default IGMP Configuration (continued)
Feature
Access to multicast groups
IGMP host-query message interval
Multilayer switch as a statically connected member
Changing the IGMP Version
By default, the multilayer switch uses IGMP Version 2, which allows features such as the IGMP query
timeout and the maximum query response time.
All systems on the subnet must support the same version. The switch does not automatically detect
Version 1 systems and switch to Version 1.
Configure the switch for Version 1 if your hosts do not support Version 2.
Beginning in privileged EXEC mode, follow these steps to change the IGMP version:
Command
Step 1
configure terminal
Step 2
interface interface-id
Step 3
ip igmp version {2 | 1}
Step 4
end
Step 5
show ip igmp interface [interface-id]
Step 6
copy running-config startup-config
To return to the default version (2), use the no ip igmp version interface configuration command.
Changing the IGMP Query Timeout for IGMPv2
If you are using IGMPv2, you can specify the period of time before the multilayer 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.
Catalyst 3550 Multilayer Switch Software Configuration Guide
24-32
Default Setting
All groups are allowed on an interface.
60 seconds on all interfaces.
Disabled.
Purpose
Enter global configuration mode.
Enter interface configuration mode, and specify the interface to be
configured.
Specify the IGMP version that the switch uses.
If you change to version 1, you cannot configure the ip igmp
Note
query-interval or the ip igmp query-max-response-time
interface configuration commands.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Chapter 24
Configuring IP Multicast Routing
78-11194-03
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