Chapter 22
| Multicast Filtering Commands
IGMP Snooping
– 547 –
ip igmp snooping
vlan general-query-
suppression
This command suppresses general queries except for ports attached to
downstream multicast hosts. Use the no form to flood general queries to all ports
except for the multicast router port.
Syntax
[no] ip igmp snooping vlan vlan-id general-query-suppression
vlan-id - VLAN ID (Range: 1-4094)
Default Setting
Disabled
Command Mode
Global Configuration
Command Usage
â—† By default, general query messages are flooded to all ports, except for the
multicast router through which they are received.
â—† If general query suppression is enabled, then these messages are forwarded
only to downstream ports which have joined a multicast service.
Example
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.
Syntax
[no] ip igmp snooping vlan vlan-id immediate-leave
vlan-id - VLAN ID (Range: 1-4094)
Default Setting
Disabled
Command Mode
Global Configuration
Command Usage
â—† 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 time out period. (The time out for this release is
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