149
◆
Snooping Enabled
–
When enabled, the switch will monitor network traffic on the
indicated VLAN interface to determine which hosts want to receive multicast traffic.
(Default: Disabled)
When MLD snooping is enabled globally, the per VLAN interface settings for MLD
snooping take precedence. When MLD snooping is disabled globally, snooping can still be
configured per VLAN interface, but the interface settings will not take effect until snooping
is re-enabled globally.
◆
MLD Querier
–
When enabled, the switch can serve as the MLDv2 Querier if selected in
the bidding process with other competing multicast routers/switches, and if selected will be
responsible for asking hosts if they want to receive multicast traffic. (Default: Disabled)
A router, or multicast-enabled switch, can periodically ask their hosts if they want to receive
multicast traffic. If there is more than one router/ switch on the LAN performing IP
multicasting, one of these devices is elected “querier” and assumes the role of querying the
LAN for group members. It then propagates the service requests on to any upstream
multicast router/switch to ensure that it will continue to receive the multicast service.
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.
◆
RV
–
The Robustness Variable allows tuning for the expected packet loss on a network. A
port will be removed from receiving 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: 1-255; Default: 2)
Routers adopt the robustness value from the most recently received query. If the querier's
robustness variable (QRV) is zero, indicating that the QRV field does not contain a
declared robustness value, the switch will set the robustness variable to the value statically
configured by this command. If the QRV exceeds 7, the maximum value of the QRV field,
the robustness value is set to zero, meaning that this device will not advertise a QRV in
any query messages it subsequently sends.
◆
QI
–
The Query Interval is the interval at which General Queries are sent by the Querier.
(Range: 1-255 seconds; Default: 125 seconds)
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 IGMP
report for the multicast groups they have joined.
◆
QRI
–
The Query Response Interval is the Max Response Time advertised in periodic
General Queries. The QRI applies when the switch is serving as the querier, and is used to
inform other devices of the maximum time this system waits for a response to general
queries. (Range: 10-31744 tenths of a second; Default: 10 seconds)
◆
LLQI
–
The Last Member Query Interval (RFC 3810
– MLDv2 for IP) sets the interval to
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