H3C Technologies H3C S5120 Series Switches - Manual (Page 313)

2-8
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
z IGMP snooping must be enabled globally before it can be enabled in a VLAN.
z When you enable IGMP snooping in a specified VLAN, this function takes effect for the 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.
z IGMP snooping version 2 can process IGMPv1 and IGMPv2 messages, but not IGMPv3 messages,
which will be flooded in the VLAN.
z IGMP snooping version 3 can process IGMPv1, IGMPv2 and IGMPv3 messages.
Follow these steps to configure the version of IGMP snooping:
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
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:
z Keep forwarding entries for version 3 static (*, G) joins;
z Clear forwarding entries from version 3 static (S, G) joins, which will be restored when IGMP
snooping is switched back to version 3.
For details about static joins, Refer to Configuring Static Ports .