Enabling Or Disabling Igmp Snooping - Cisco WS-C2960-24LC-S Software Configuration Manual

Chapter 18 Configuring IGMP Snooping and MVR
Table 18-3
Feature
Multicast router learning (snooping) method
IGMP snooping Immediate Leave
Static groups
TCN
TCN query solicitation
IGMP snooping querier
IGMP report suppression
1. TCN = Topology Change Notification

Enabling or Disabling IGMP Snooping

By default, IGMP snooping is globally enabled on the switch. When globally enabled or disabled, it is
also enabled or disabled in all existing VLAN interfaces. IGMP snooping is by default enabled on all
VLANs, but can be enabled and disabled on a per-VLAN basis.
Global IGMP snooping overrides the VLAN IGMP snooping. If global snooping is disabled, you cannot
enable VLAN snooping. If global snooping is enabled, you can enable or disable VLAN snooping.
Beginning in privileged EXEC mode, follow these steps to globally enable IGMP snooping on the
switch:
Command
Step 1 configure terminal
Step 2 ip igmp snooping
Step 3
end
Step 4 copy running-config startup-config
To globally disable IGMP snooping on all VLAN interfaces, use the no ip igmp snooping global
configuration 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
OL-8603-04
Default IGMP Snooping Configuration (continued)
1
flood query count
Purpose
Enter global configuration mode.
Globally enable IGMP snooping in all existing VLAN interfaces.
Return to privileged EXEC mode.
(Optional) Save your entries in the configuration file.
Default Setting
PIM-DVMRP
Disabled
None configured
2
Disabled
Disabled
Enabled
Purpose
Enter global configuration mode.
Enable IGMP snooping on the VLAN interface.The VLAN ID range
is 1 to 1001 and 1006 to 4094.
IGMP snooping must be globally enabled before you can
Note
enable VLAN snooping.
Catalyst 2960 Switch Software Configuration Guide
Configuring IGMP Snooping
18-7