Enabling Igmp Immediate-Leave Processing - Cisco Catalyst 2950 Software Configuration Manual

Chapter 16 Configuring IGMP Snooping and MVR
Command
Step 4
show ip igmp snooping mrouter vlan vlan-id
or
show mac-address-table multicast [vlan
vlan-id] [user | igmp-snooping] [count]
Step 5 copy running-config startup-config
To remove the port from the multicast group, use the no ip igmp snooping vlan vlan-id static
mac-address interface interface-id global configuration command.
This example shows how to statically configure a host on an interface and verify the configuration:
Switch# configure terminal
Switch(config)# ip igmp snooping vlan 1 static 0100.5e00.0203 interface gigabitethernet0/1
Switch(config)# end
Switch# show mac-address-table multicast vlan 1
Vlan
----
1

Enabling IGMP Immediate-Leave Processing

When you enable IGMP Immediate-Leave processing, the switch immediately removes a port from the
IP multicast group when it detects an IGMP version 2 leave message on that port. Immediate-Leave
processing allows the switch to remove an interface that sends a leave message from the forwarding table
without first sending out group-specific queries to the interface. You should use the Immediate-Leave
feature only when there is only a single receiver present on every port in the VLAN.
Immediate-Leave is supported only with IGMP version 2 hosts.
Beginning in privileged EXEC mode, follow these steps to enable IGMP Immediate-Leave processing:
Command
Step 1 configure terminal
Step 2 ip igmp snooping vlan vlan-id
immediate-leave
Step 3 end
Step 4
show ip igmp snooping vlan vlan-id
Step 5
copy running-config startup-config
To disable Immediate-Leave processing, use the no ip igmp snooping vlan vlan-id immediate-leave
global configuration command.
78-11380-04
Mac Address Type
----------- ----
0100.5e00.0203 USER
Purpose
Enter global configuration mode.
Enable IGMP Immediate-Leave processing on the VLAN interface.
Return to privileged EXEC mode.
Verify that Immediate Leave is enabled on the VLAN.
(Optional) Save your entries in the configuration file.
Purpose
Verify that the member port is a member of the VLAN multicast
group.
Verify the member port and the MAC address
(Optional) Save your entries in the configuration file.
Ports
-----
Gi0/1
Catalyst 2950 Desktop Switch Software Configuration Guide
Configuring IGMP Snooping
16-9