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PowerConnect B-Series FCX Configuration Guide 657
53-1002266-01
Configuring IGMP snooping
22
Modifying the age interval
When the device receives a group membership report, it makes an entry for that group in the IGMP
group table. The age interval specifies how long the entry can remain in the table before the device
receives another group membership report. When multiple devices connect together, all devices
must be configured for the same age interval, which must be at least twice the length of the query
interval, so that missing one report won't stop traffic. Non-querier age intervals must be the same
as the age interval of the querier.
To modify the age interval, enter the following command.
PowerConnect(config)# ip multicast age-interval 280
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 140 seconds.
Modifying the query interval (active IGMP snooping mode only)
For a device with an active IGMP 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.
PowerConnect(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.
Configuring the global IGMP version
You can globally specify IGMPv2 or IGMPv3 for the device. The default is IGMPv2. For example, the
following command causes the device to use IGMPv3.
PowerConnect(config)# ip multicast version 3
Syntax: [no] ip multicast version 2 | 3
You can also optionally specify the IGMP version for individual VLANs, or individual ports within
VLANs. When no IGMP version is specified for a VLAN, the global IGMP version is used. When an
IGMP version is specified for individual ports within a VLAN, the ports use that version, instead of
the VLAN version or the global version. The default is IGMPv2.
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 IGMPv2 only. The leave messages are not rate limited.