ip igmp snooping forced fastleave
Syntax
ip igmp snooping forced-fastleave <PORT-LIST>
no ip igmp snooping forced-fastleave <PORT-LIST>
Description
Configures the specified ports in forced fastleave mode.
The
no
form of this command disables forced fastleave on the specified ports.
Command context
config-vlan
Parameters
fastleave <PORT-LIST>
Specifies a list of one or more ports to be configured as forced fastleave ports. You can specify a single port, a comma-separated list of ports or a range of ports such as 1/1/1-1/1/3.
Authority
Administrators or local user group members with execution rights for this command.
Usage
With forced fastleave enabled, IGMP speeds up the process of blocking unnecessary multicast traffic to a switch port that is connected to multiple end nodes. When a port having multiple end nodes receives a leave group request from one end node for a given multicast group, forced fastleave activates and waits for a second to receive a join request from any other member of the same group on that port. If the port does not receive a join request for that group within the forced fastleave interval, the switch then blocks any further traffic to that group on that port.
Examples
Configuring forced-fastleave ports for the VLAN:
switch(config)# vlan 2 switch(config-vlan)# ip igmp snooping forced-fastleave 1/1/1 switch(config-vlan)# ip igmp snooping forced-fastleave 1/1/1-1/1/2 switch(config-vlan)# ip igmp snooping forced-fastleave 1/1/1,1/1/2-1/1/3 switch(config-vlan)# no ip igmp snooping forced-fastleave 1/1/1 switch(config-vlan)# no ip igmp snooping forced-fastleave 1/1/1-1/1/2