R21xx-HP FlexFabric 11900 IP Multicast Configuration Guide

18
Enabling IGMP snooping
When you enable IGMP snooping, follow these guidelines:
• You must enable IGMP snooping globally before you enable it for a VLAN.
• IGMP snooping for a VLAN takes effect only on the ports in that VLAN.
To enable IGMP snooping:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enable IGMP snooping
globally and enter
IGMP-snooping view.
igmp-snooping
By default, IGMP snooping is
disabled.
3. Return to system view.
quit N/A
4. Enter VLAN view.
vlan vlan-id N/A
5. Enable IGMP snooping for the
VLAN.
igmp-snooping enable
By default, IGMP snooping for a
VLAN is disabled.
Specifying the IGMP snooping version
Different versions of IGMP snooping can process different versions of IGMP messages.
• IGMPv2 snooping can process IGMPv1 and IGMPv2 messages, but it floods IGMPv3 messages in
the VLAN instead of processing them.
• IGMPv3 snooping can process IGMPv1, IGMPv2, and IGMPv3 messages.
If you change IGMPv3 snooping to IGMPv2 snooping, the device does the following:
• Clears all IGMP snooping forwarding entries that are dynamically added.
• Keeps static IGMPv3 snooping forwarding entries (*, G).
• Clears static IGMPv3 snooping forwarding entries (S, G), which will be restored when IGMP
snooping is switched back to IGMPv3 snooping.
For more information about static IGMP snooping forwarding entries, see "Configuring static ports."
T
o specify the IGMP snooping version:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter VLAN view.
vlan vlan-id N/A
3. Specify the version of IGMP
snooping.
igmp-snooping version
version-number
The default setting is IGMPv2
snooping.