Concept Guide

Removing a Group-Port Association
To congure or view the remove a group-port association feature, use the following commands.
• Congure the switch to remove a group-port association after receiving an IGMP Leave message.
INTERFACE VLAN mode
ip igmp fast-leave
• View the conguration.
INTERFACE VLAN mode
show config
Example of Conguration Output After Removing a Group-Port Association
DellEMC(conf-if-vl-100)#show config
!
interface Vlan 100
no ip address
ip igmp snooping fast-leave
shutdown
DellEMC(conf-if-vl-100)#
Disabling Multicast Flooding
If the switch receives a multicast packet that has an IP address of a group it has not learned (unregistered frame), the switch oods that
packet out of all ports on the VLAN.
When you congure the no ip igmp snooping flood command, the system drops the packets immediately. The system does not
forward the frames on mrouter ports, even if they are present. Disable Layer 3 multicast (
no ip multicast-routing) in order to
disable multicast ooding.
• Congure the switch to only forward unregistered packets to ports on a VLAN that are connected to mrouter ports.
CONFIGURATION mode
no ip igmp snooping flood
Specifying a Port as Connected to a Multicast Router
To statically specify or view a port in a VLAN, use the following commands.
• Statically specify a port in a VLAN as connected to a multicast router.
INTERFACE VLAN mode
ip igmp snooping mrouter
• View the ports that are connected to multicast routers.
EXEC Privilege mode.
show ip igmp snooping mrouter
372
Internet Group Management Protocol (IGMP)