ECS4510 Series Web Management Guide-R03

Chapter 14 | Multicast Filtering
MLD Snooping (Snooping and Query for IPv6)
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include MLDv2 query and report messages, as well as MLDv1 report and done
messages.
Remember that IGMP Snooping and MLD Snooping are independent functions,
and can therefore both function at the same time.
Configuring MLD
Snooping and Query
Parameters
Use the Multicast > MLD Snooping > General page to configure the switch to
forward multicast traffic intelligently. Based on the MLD query and report
messages, the switch forwards multicast traffic only to the ports that request it. This
prevents the switch from broadcasting the traffic to all ports and possibly
disrupting network performance.
Parameters
These parameters are displayed:
◆ MLD Snooping Status – When enabled, the switch will monitor network traffic
to determine which hosts want to receive multicast traffic. (Default: Disabled)
◆ Querier Status – When enabled, the switch can serve as the querier for MLDv2
snooping if elected. The querier is responsible for asking hosts if they want to
receive multicast traffic. (Default: Disabled)
An IPv6 address must be configured on the VLAN interface from which the
querier will act if elected. When serving as the querier, the switch uses this IPv6
address as the query source address.
The querier will not start or will disable itself after having started if it detects an
IPv6 multicast router on the network.
◆ Robustness – MLD Snooping robustness variable. A port will be removed from
the receiver list for a multicast service when no MLD reports are detected in
response to a number of MLD queries. The robustness variable sets the number
of queries on ports for which there is no report. (Range: 2-10 Default: 2)
◆ Query Interval – The interval between sending MLD general queries.
(Range: 60-125 seconds; Default: 125 seconds)
This attribute applies when the switch is serving as the querier.
An MLD general query message is sent by the switch at the interval specified by
this attribute. When this message is received by downstream hosts, all receivers
build an MLD report for the multicast groups they have joined.
◆ Query Max Response Time – The maximum response time advertised in MLD
general queries. (Range: 5-25 seconds; Default: 10 seconds)
This attribute controls how long the host has to respond to an MLD Query
message before the switch deletes the group if it is the last member.
◆ Router Port Expiry Time – The time the switch waits after the previous querier
stops before it considers the router port (i.e., the interface that had been