Configuration Guide User guide

1472 FastIron Configuration Guide
53-1002494-02
IGMP snooping configuration
Syntax: [no] ip multicast age-interval <interval>
The <interval> parameter specifies the aging time. You can specify a value from 20 through 7200
seconds. The default is 260 seconds.
Modifying the query interval (active IGMP snooping
mode only)
If IP multicast traffic reduction is set to active mode, you can modify the query interval to specify
how often the device sends general queries. When multiple queriers connect together, they must
all be configured with the same query interval.
To modify the query interval, enter the following command.
Brocade(config)# ip multicast query-interval 120
Syntax: [no] ip multicast query-interval <interval>
The <interval> parameter specifies the time between queries. You can specify a value from 10
through 3600 seconds. The default is 125 seconds.
Modifying the maximum response time
The maximum response time is the number of seconds that a client can wait before responding to
a query sent by the switch.
To change the maximum response time, enter the following command.
Brocade(config)# ip multicast max-response-time 5
Syntax: [no] ip multicast max-response-time <interval>
For <interval>, enter a value from 1 through 10 seconds. The default is 10 seconds.
Configuring report control
A device in passive mode forwards reports and leave messages from clients to the upstream router
ports that are receiving queries.
You can configure report control to rate-limit report forwarding within the same group to no more
than once every 10 seconds. This rate-limiting does not apply to the first report answering a
group-specific query.
NOTE
This feature applies to IGMP V2 only. The leave messages are not rate limited.
IGMP V2 membership reports of the same group from different clients are considered to be the
same and are rate-limited.
Use the ip multicast report-control command to alleviate report storms from many clients
answering the upstream router query.
Brocade(config)# ip multicast report-control
Syntax: [no] ip multicast report-control