Dell PowerEdge M805 Manuel d'utilisateur Page 219

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IGMP Snooping Commands 189
ip igmp snooping (VLAN)
Use the
ip igmp snooping
command in VLAN Configuration mode to enable IGMP snooping on a
particular interface or on all interfaces participating in a VLAN. To disable IGMP snooping use the
no
form of this command.
Syntax
ip igmp snooping
vlan-id
no ip igmp snooping
Default Configuration
IGMP snooping is disabled on VLAN interfaces by default.
Command Mode
VLAN Configuration mode
User Guidelines
This command has no user guidelines.
Example
The following example enables IGMP snooping on VLAN 2.
console(config-vlan)#ip igmp snooping 2
ip igmp snooping fast-leave
This command enables or disables IGMP Snooping fast-leave mode on a selected VLAN. Enabling
fast-leave allows the switch to immediately remove the layer 2 LAN interface from its forwarding
table entry upon receiving an IGMP leave message for that multicast group without first sending
out MAC-based general queries to the interface. The
no
form of this command disables IGMP
Snooping fast-leave mode on a VLAN.
You should enable fast-leave admin mode only on VLANs where only one host is connected to each
layer 2 LAN port. This setting prevents the inadvertent dropping of the other hosts that were
connected to the same layer 2 LAN port but were still interested in receiving multicast traffic
directed to that group. Also, fast-leave processing is supported only with IGMP version 2 hosts.
Syntax
ip igmp snooping fast-leave
vlan-id
no ip igmp snooping fast-leave
vlan id
—Number assigned to the VLAN.
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