H3C Technologies H3C S3100V2 Series Switches - Manual (Page 27)

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NOTE:
•
Enable IGMP snooping globally before enable it in a VLAN.
• When you enable IGMP snooping in a specified VLAN, this function takes effect on 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.
• 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:
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
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:
• Keep forwarding entries for version 3 static (*, G) joins.
• Clear forwarding entries from version 3 static (S, G) joins, which will be restored when IGMP snooping
is switched back to version 3.
For more information about static joins, see “ Configuring static ports .”
Configuring static multicast MAC address entries
In Layer-2 multicast, a Layer 2 multicast protocol—such as IGMP snooping—can dynamically add
multicast MAC address entries. You can also configure static multicast MAC address entries.
Configuring a static multicast MAC address entry in system view
Follow these steps to configure a static multicast MAC address entry in system view
To do... Use the command... Remarks
Enter system view system-view —
Configure a static multicast MAC
address entry mac-address multicast mac-address
interface interface-list vlan vlan-id
Required
No static multicast MAC address
entries exist by default.