Chapter 21
| Multicast Filtering Commands
IGMP Snooping
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Also, when the switch is acting in the role of a multicast host (such as when
using proxy routing), it should ignore version 2 or 3 queries that do not contain
the Router Alert option.
Example
Console(config)#ip igmp snooping router-alert-option-check
Console(config)#
ip igmp snooping
router-port-
expire-time
This command configures the querier timeout. Use the
no
form to restore the
default.
Syntax
ip igmp snooping router-port-expire-time
seconds
no ip igmp snooping router-port-expire-time
seconds
- The time the switch waits after the previous querier stops
before it considers it to have expired. (Range: 1-65535;
Recommended Range: 300-500)
Default Setting
300 seconds
Command Mode
Global Configuration
Example
The following shows how to configure the timeout to 400 seconds:
Console(config)#ip igmp snooping router-port-expire-time 400
Console(config)#
ip igmp snooping
tcn-flood
This command enables flooding of multicast traffic if a spanning tree topology
change notification (TCN) occurs. Use the
no
form to disable flooding.
Syntax
[
no
]
ip igmp snooping tcn-flood
Default Setting
Disabled
Command Mode
Global Configuration
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