LevelOne GTL-2691 - Manual (Page 1195)

C HAPTER 42 | Multicast Filtering Commands
IGMP Snooping
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C OMMAND M ODE
Global Configuration
C OMMAND U SAGE
◆ By default, general query messages are flooded to all ports, except for
the multicast router through which they are received.
◆ If general query suppression is enabled, then these messages are
forwarded only to downstream ports which have joined a multicast
service.
E XAMPLE
Console(config)#ip igmp snooping vlan 1 general-query-suppression
Console(config)#
ip igmp snooping
vlan immediate-
leave
This command immediately deletes a member port of a multicast service if
a leave packet is received at that port and immediate-leave is enabled for
the parent VLAN. Use the no form to restore the default.
S YNTAX
[no] ip igmp snooping vlan vlan-id immediate-leave
vlan-id - VLAN ID (Range: 1-4093)
D EFAULT S ETTING
Disabled
C OMMAND M ODE
Global Configuration
C OMMAND U SAGE
◆ If immediate-leave is not used, a multicast router (or querier) will send
a group-specific query message when an IGMPv2/v3 group leave
message is received. The router/querier stops forwarding traffic for that
group only if no host replies to the query within the timeout period.
(The timeout for this release is currently defined by ip igmp snooping
vlan last-memb-query-intvl * ip igmp robustval .
◆ If immediate-leave is enabled, the switch assumes that only one host is
connected to the interface. Therefore, immediate leave should only be
enabled on an interface if it is connected to only one IGMP-enabled
device, either a service host or a neighbor running IGMP snooping.
◆ This command is only effective if IGMP snooping is enabled, and
IGMPv2 or IGMPv3 snooping is used.