Configuring Igmp Snooping - Cisco NM-8B-U - HW ROUTERS L-M User Manual

Configuration Tasks
The RPF-MFD flag indicates that the flow is completely hardware switched. The H flag indicates that
Note
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:
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Enabling or Disabling IGMP Snooping
By default, IGMP snooping is globally enabled on the Ethernet switch network module. 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
Ethernet switch network module:
Command
Step 1
configure terminal
Step 2
ip igmp snooping
Step 3 end
Step 4 show ip igmp snooping
Step 5
copy running-config startup-config
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:
Command
Step 1 configure terminal
Step 2
ip igmp snooping vlan vlan-id
Step 3
end
Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ
102
16- and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series
Enabling or Disabling IGMP Snooping, page 102
Enabling IGMP Immediate-Leave Processing, page 103
Statically Configuring an Interface to Join a Group, page 103
Configuring a Multicast Router Port, page 104
Purpose
Enters global configuration mode.
Globally enables IGMP snooping in all existing VLAN interfaces.
Returns to privileged EXEC mode.
Displays snooping configuration.
(Optional) Saves your configuration to the startup configuration.
Purpose
Enters global configuration mode.
Enables IGMP snooping on the VLAN interface.
Returns to privileged EXEC mode.