Configuring Basic Functions of IGMP Snooping 559
Configuring Basic
Functions of IGMP
Snooping
Configuration
Prerequisites
Before configuring the basic functions of IGMP Snooping, complete the following
task:
■ Configure the corresponding VLANs.
Before configuring the basic functions of IGMP Snooping, prepare the following
data:
■ Version of IGMP Snooping.
Enabling IGMP Snooping Follow these steps to enable IGMP Snooping:
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■ IGMP Snooping must be enabled globally before it can be enabled in a VLAN.
■ After enabling IGMP Snooping in a VLAN, you cannot enable IGMP and/or PIM
on the corresponding VLAN interface, and vice versa.
■ When you enable IGMP Snooping in a specified VLAN, this function takes
effect for Ethernet ports in this VLAN only.
Configuring the Version
of IGMP Snooping
By configuring an IGMP Snooping version, you actually configure the version of
IGMP messages that IGMP Snooping can process.
■ IGMP Snooping version 2 can process IGMPv1 and IGMPv2 messages, but not
IGMPv3 messages, which will be flooded in the VLAN.
■ IGMP Snooping version 3 can process IGMPv1, IGMPv2 and IGMPv3 messages.
Follow these steps to configure the version of IGMP Snooping:
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CAUTION: If you switch IGMP Snooping from version 3 to version 2, the system
will clear all IGMP Snooping forwarding entries from dynamic joins, and will
To do… Use the command… Remarks
Enter system view system-view -
Enable IGMP Snooping
globally and enter
IGMP-Snooping view
igmp-snooping Required
Disabled by default
Return to system view quit -
Enter VLAN view vlan vlan-id -
Enable IGMP Snooping in the
VLAN
igmp-snooping enable Required
Disabled by default
To do… Use the command… Remarks
Enter system view system-view -
Enter VLAN view vlan vlan-id -
Configure the version of IGMP
Snooping
igmp-snooping version
version-number
Optional
Version 2 by default
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