C
HAPTER
4
| Configuring the Switch
MLD Snooping
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The switch can be configured to immediately delete a member port of a
multicast service if a leave packet is received at that port and the Fast
Leave function is enabled. This allows the switch to remove a port from
the multicast forwarding table without first having to send an MLD
group-specific (GS) query to that interface.
If Fast Leave is not used, a multicast router (or querier) will send a
GS-query message when a group leave message is received. The
router/querier stops forwarding traffic for that group only if no host
replies to the query within the specified timeout period.
If Fast Leave is enabled, the switch assumes that only one host is
connected to the interface. Therefore, Fast Leave should only be
enabled on an interface if it is connected to only one MLD-enabled
device, either a service host or a neighbor running MLD snooping.
Fast Leave does not apply to a port if the switch has learned that a
multicast router is attached to it.
Fast Leave can improve bandwidth usage for a network which
frequently experiences many MLD host add and leave requests.
â—† Throttling - Limits the number of multicast groups to which a port can
belong. (Range: 1-10; Default: unlimited)
MLD throttling sets a maximum number of multicast groups that a port
can join at the same time. When the maximum number of groups is
reached on a port, any new MLD listener reports will be dropped.
WEB INTERFACE
To configure global and port-related settings for MLD Snooping:
1. Click Configuration, IPMC, MLD Snooping, Basic Configuration.
2. Adjust the MLD settings as required.
3. Click Save.
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