Configuration Guide User guide

FastIron Configuration Guide 1617
53-1002494-02
MLD snooping configuration
NOTE
This command has no effect on a VLAN that is not snooping-enabled because all multicast traffic is
VLAN flooded.
Brocade(config)#interface ethernet 1/3
Brocade(config-if-e1000-1/3)#ipv6-multicast-disable
Syntax: [no] ipv6-multicast-disable
Configuring the global MLD mode
You can configure a Brocade device for either active or passive (default) MLD mode. If you specify
an MLD mode for a VLAN, the MLD mode overrides the global setting.
• Active – In active MLD mode, a device actively sends out MLD queries to identify IPv6 multicast
groups on the network, and makes entries in the MLD table based on the group membership
reports it receives from the network.
• Passive – In passive MLD mode, the device forwards reports to the router ports which receive
queries. MLD snooping in passive mode does not send queries, but does forward queries to
the entire VLAN.
To globally set the MLD mode to active, enter the ipv6 mld-snooping active command.
Brocade(config)#ipv6 mld-snooping active
Syntax: [no] ipv6 mld-snooping [active | passive]
Omitting both the active and passive keywords is the same as entering ipv6 mld-snooping passive.
Modifying the age interval
When the device receives a group membership report, it makes an entry in the MLD 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. When multiple devices connect
together, all devices should be configured with the same age interval. The age interval should be at
least twice that of the query interval, so that missing one report will not stop traffic. For a
non-querier, the query interval should equal that of the querier.
To modify the age interval, enter a command such as the following.
Brocade(config)#ipv6 mld-snooping age-interval 280
Syntax: [no] ipv6 mld-snooping age-interval <interval>
The <interval> parameter specifies the aging time. You can specify a value from 20 – 7200
seconds. The default is 140 seconds.
Modifying the query interval (active MLD snooping
mode only)
If the MLD mode is set to active, you can modify the query interval, which specifies how often the
Brocade device sends group membership queries. By default, queries are sent every 60 seconds.
When multiple queriers connect together, all queriers should be configured with the same interval.
To modify the query interval, enter the ipv6 mld-snooping query-interval <num> command.