Installation guide
Cisco HWIC-4ESW and HWIC-D-9ESW EtherSwitch Interface Cards
How to Configure EtherSwitch HWICs
42
Cisco IOS Release 12.3(8)T4
OL-6454-01
(*, 224.10.10.10), 00:09:21/00:02:56, RP 0.0.0.0, flags:DC
Incoming interface:Null, RPF nbr 0.0.0.0
Outgoing interface list:
Vlan1, Forward/Sparse-Dense, 00:09:21/00:00:00, H
Router#
Note The RPF-MFD flag indicates that the flow is completely hardware switched. The H flag indicates that
the flow is hardware-switched on the outgoing interface.
Configuring IGMP Snooping
This section describes how to configure IGMP snooping on your router and consists of the following
configuration information and procedures:
• Enabling or Disabling IGMP Snooping, page 42
• Enabling IGMP Immediate-Leave Processing, page 43
• Statically Configuring an Interface to Join a Group, page 44
• Configuring a Multicast Router Port, page 45
Enabling or Disabling IGMP Snooping
By default, IGMP snooping is globally enabled on the EtherSwitch HWIC. When globally enabled or
disabled, it is also enabled or disabled in all existing VLAN interfaces. By default, IGMP snooping is
enabled on all VLANs, but it can be enabled and disabled on a per-VLAN basis.
Global IGMP snooping overrides the per-VLAN IGMP snooping capability. If global snooping is
disabled, you cannot enable VLAN snooping. If global snooping is enabled, you can enable or disable
snooping on a VLAN basis.
Beginning in privileged EXEC mode, follow these steps to globally enable IGMP snooping on the
EtherSwitch HWIC.
SUMMARY STEPS
1. configure terminal
2. ip igmp snooping
3. end
4. show ip igmp snooping
5. copy running-config startup-config
DETAILED STEPS
Command Purpose
Step 1
configure terminal
Enters global configuration mode.
Step 2
ip igmp snooping
Globally enables IGMP snooping in all existing VLAN interfaces.
Step 3
end
Returns to privileged EXEC mode.