Installation guide

Cisco HWIC-4ESW and HWIC-D-9ESW EtherSwitch Interface Cards
How to Configure EtherSwitch HWICs
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Cisco IOS Release 12.3(8)T4
OL-6454-01
To globally disable IGMP snooping on all VLAN interfaces, use the no ip igmp snooping global
command.
Beginning in privileged EXEC mode, follow these steps to enable IGMP snooping on a VLAN interface.
SUMMARY STEPS
1. configure terminal
2. ip igmp snooping vlan vlan-id
3. end
4. show ip igmp snooping [vlan vlan-id ]
5. copy running-config startup-config
DETAILED STEPS
To disable IGMP snooping on a VLAN interface, use the no ip igmp snooping vlan vlan-id global
configuration command for the specified VLAN number (for example, vlan1).
Enabling IGMP Immediate-Leave Processing
When you enable IGMP Immediate-Leave processing, the EtherSwitch HWIC 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.
Step 4
show ip igmp snooping
Displays snooping configuration.
Step 5
copy running-config
startup-config
(Optional) Saves your configuration to the startup configuration.
Command Purpose
Command Purpose
Step 1
configure terminal
Enters global configuration mode.
Step 2
ip igmp snooping vlan vlan-id
Enables IGMP snooping on the VLAN interface.
Step 3
end
Returns to privileged EXEC mode.
Step 4
show ip igmp snooping [vlan
vlan-id ]
Displays snooping configuration.
(Optional) vlan-id is the number of the VLAN.
Step 5
copy running-config
startup-config
(Optional) Saves your configuration to the startup configuration.