Disabling IGMP snooping on a VLAN
Disabling IGMP snooping on a VLAN
When IGMP snooping is enabled globally, you can still disable it for a specific VLAN. For example, the following commands cause IGMP snooping to be disabled for VLAN 20. This setting overrides the global setting.
device(config)#vlan 20
Syntax: [no] multicast
Modifying the age interval for group membership entries
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.
To modify the age interval, enter the following command.
device(config)#ip multicast
Syntax: [no] ip multicast age-interval interval
The interval parameter specifies the aging time. You can specify a value from 20 through 26000 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.
device(config)#ip multicast
Syntax: [no] ip multicast query-intervalinterval
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.
device(config)#ip multicast
Syntax: [no] ip multicast max-response-time interval
For interval , enter a value from 1 through 10 seconds. The default is 10 seconds.
22 | FastIron Ethernet Switch IP Multicast Configuration Guide |
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