3Com Switch 4200G Configuration Guide

252 CHAPTER 29: IGMP SNOOPING CONFIGURATION
IGMP Snooping
Configuration
The following sections describe the IGMP Snooping configuration tasks.
■ Enabling IGMP Snooping
■ Configuring Timers
■ Enabling IGMP Fast Leave Processing
■ Configuring IGMP Snooping Filtering ACL
■ Configuring to Limit Port Multicast Group Number
■ Configuring Multicast VLAN
Among them, enabling IGMP Snooping is required, while others are optional (you can
determine whether or not to perform these tasks according to your needs).
Enabling IGMP Snooping You can use the command here to enable IGMP Snooping so that it can establish and
maintain MAC multicast forwarding tables at layer 2.
CAUTION: Although both Layer 2 and Layer 3 multicast protocols can run on the
same switch simultaneously, they cannot run simultaneously on a VLAN and its
corresponding VLAN interface.
IGMP Snooping functions on a VLAN only when it is first enabled globally in system
view and then enabled in the VLAN view.
Table 222 Enable IGMP Snooping
Operation Command Description
Enter system view system-view —
Enable IGMP Snooping
globally
igmp-snooping enable Required
IGMP Snooping is
disabled globally.
Enter VLAN view vlan vlan-id —
Enable IGMP Snooping
on the VLAN
igmp-snooping enable Required
By default, IGMP
Snooping is disabled on
the VLAN.