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C
VLAN
ONFIGURING
S
IGMP
ETTINGS FOR
S
Q
NOOPING AND
UERY
Use the IGMP Snooping VLAN Configuration page to configure IGMP
snooping and query for a VLAN interface
P
ATH
Configuration, IPMC, IGMP Snooping, VLAN Configuration
P
ARAMETERS
These parameters are displayed:
◆
VLAN ID - VLAN Identifier.
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: Enabled)
When IGMP snooping is enabled globally, the per VLAN interface
settings for IGMP snooping take precedence. When IGMP 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.
IGMP Querier - When enabled, the switch can serve as the Querier
◆
(on the selected interface), which is 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 switch/router to ensure that it will continue to receive the
multicast service. This feature is not supported for IGMPv3 snooping.
◆
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 IGMP reports are detected in response to a number of
IGMP 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 MLD 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 MLD report for the multicast
groups they have joined.
– 137 –
| Configuring the Switch
C
4
HAPTER
IGMP Snooping
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