AMX NXA-ENET8-2POE Operation/Reference Manual page 116

Configuring the NXA-ENET8-2POE
MLD Snooping Configuration parameters (Cont.)
Global Configuration (Cont.)
• Leave Proxy
Enabled
• Proxy Enabled
Port Related Configuration
• Port
• Router Port
• Fast Leave
• Throttling
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Suppresses leave messages unless received from the last member port in the
group. (Default: Disabled) MLD leave proxy suppresses all unnecessary MLD
leave messages so that a non-querier switch forwards an MLD leave packet only
when the last dynamic member port leaves a multicast group.
The leave-proxy feature does not function when a switch is set as the querier.
When the switch is a non-querier, the receiving port is not the last dynamic mem-
ber port in the group, and the receiving port is not a router port, the switch will
generate and send a group-specific (GS) query to the member port which
received the leave message, and then start the last member query timer for that
port.
When the conditions in the preceding item all apply, except that the receiving port
is a router port, then the switch will not send a GS-query, but will immediately start
the last member query timer for that port.
Configures the switch to issue MLD host report messages on behalf of hosts dis-
covered through standard MLD interfaces. (Default: Disabled)
When MLD proxy is enabled, the switch exchanges MLD messages with the
router on its upstream interface, and performs the host portion of the MLD task on
the upstream interface as follows:
When queried, it sends multicast listener reports to the group.
When a host joins a multicast group to which no other host belongs, it sends
unsolicited multicast listener reports to that group.
When the last host in a particular multicast group leaves, it sends an unsolicited
multicast listener done report to the all-routers address (FF02::2) for MLDv1.
Port identifier.
Sets a port to function as a router port, which leads towards a Layer 3 multicast
device or MLD querier. (Default: Disabled)
If MLD snooping cannot locate the MLD querier, you can manually designate a
port which is connected to a known MLD querier (i.e., a multicast router/switch).
This interface will then join all the current multicast groups supported by the
attached router/switch to ensure that multicast traffic is passed to all appropriate
interfaces within the switch.
Immediately deletes a member port of a multicast service if a leave packet is
received at that port. (Default: Disabled) The switch can be configured to immedi-
ately 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 mes-
sage when a group leave message is received. The router/querier stops forward-
ing 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 experi-
ences many MLD host add and leave requests.
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.
NXA-ENET8-2POE Gigabit Ethernet Layer 2 PoE Switch