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1<br />
MLD snooping configuration<br />
For all devices except the ICX 6430, num is a value from 256 – 8192. The default is 4096.<br />
For the ICX 6430, num is a value from 256 – 4096. The default is 1024.<br />
Configuring the global MLD mode<br />
You can configure a <strong>Brocade</strong> device for either active or passive (default) MLD mode. If you specify<br />
an MLD mode for a VLAN, the MLD mode overrides the global setting.<br />
• Active – In active MLD mode, a device actively sends out MLD queries to identify IPv6 multicast<br />
groups on the network, and makes entries in the MLD table based on the group membership<br />
reports it receives from the network.<br />
• Passive – In passive MLD mode, the device forwards reports to the router ports which receive<br />
queries. MLD snooping in passive mode does not send queries, but does forward queries to<br />
the entire VLAN.<br />
To globally set the MLD mode to active, enter the ipv6 multicast active command.<br />
<strong>Brocade</strong>(config)#ipv6 multicast active<br />
Syntax: [no] ipv6 multicast [active | passive]<br />
Omitting both the active and passive keywords is the same as entering ipv6 multicast passive.<br />
NOTE<br />
The ipv6 mld-snooping command is replaced by the ipv6 multicast command; the mld-snooping<br />
command is replaced by the multicast6 command.<br />
Modifying the age interval<br />
When the device receives a group membership report, it makes an entry in the MLD group table for<br />
the group in the report. The age interval specifies how long the entry can remain in the table<br />
without the device receiving another group membership report. When multiple devices connect<br />
together, all devices should be configured with the same age interval. The age interval should be at<br />
least twice that of the query interval, so that missing one report will not stop traffic. For a<br />
non-querier, the query interval should equal that of the querier.<br />
To modify the age interval, enter a command such as the following.<br />
<strong>Brocade</strong>(config)#ipv6 multicast age-interval 280<br />
Syntax: [no] ipv6 multicast age-interval interval<br />
The interval parameter specifies the aging time. You can specify a value from 20 – 7200 seconds.<br />
The default is 260 seconds.<br />
Modifying the query interval (active MLD snooping<br />
mode only)<br />
If the MLD mode is set to active, you can modify the query interval, which specifies how often the<br />
<strong>Brocade</strong> device sends group membership queries. By default, queries are sent every 60 seconds.<br />
When multiple queriers connect together, all queriers should be configured with the same interval.<br />
8 FastIron Ethernet Switch IP Multicast Configuration Guide<br />
53-1002638-02