Brocade Multi-Service IronWare Multicast Configuration Guide (Supporting R05.6.00) - Manual (Page 137)

Multi-Service IronWare Multicast Configuration Guide 125
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IP multicast traffic reduction
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• Passive – When passive IGMP mode is enabled, the device listens for IGMP Group
Membership reports but does not send IGMP queries. The passive mode is sometimes called
“IGMP snooping”. Use this mode when another device in the network is actively sending
queries.
To enable active IGMP, enter the following command.
Brocade(config)# ip multicast active
Syntax: [no] ip multicast active | passive
To enable passive IGMP, enter the following command.
Brocade(config)# ip multicast passive
Modifying the query interval
If IP Multicast Traffic Reduction is set to active mode, you can modify the query interval, which
specifies how often a Brocade device enabled for active IP Multicast Traffic Reduction sends group
membership queries.
NOTE
The query interval applies only to the active mode of IP Multicast Traffic reduction.
To modify the query interval, enter a command such as the following.
Brocade(config)# ip multicast query-interval 120
Syntax: [no] ip multicast query-interval interval
The interval parameter specifies the interval between queries. You can specify a value from 10 –
600 seconds. The default is 125 seconds.
Modifying the age interval
When the device receives a Group Membership report, the device makes an entry in the IGMP
group table for the group in the report. The age interval specifies how long the entry can remain in
the table without the device receiving another Group Membership report.
To modify the age interval, enter a command such as the following.
Brocade(config)# ip multicast age-interval 280
Syntax: [no] ip multicast age-interval interval
The interval parameter specifies the interval between queries. You can specify a value from 10 –
1220 seconds. The default is 260 seconds.
Filtering multicast groups
By default, the Brocade device forwards multicast traffic for all valid multicast groups. You can
configure a Brocade device to filter out all multicast traffic for groups other than the ones for which
the device has received Group Membership reports.
When the device starts up, it forwards all multicast groups even though multicast traffic filters are
configured. This process continues until the device receives a group membership report. Once the
group membership report is received, the device drops all multicast packets for groups other than
the ones for which the device has received the group membership report.