R3102-R3103-HP 6600/HSR6600 Routers IP Multicast Configuration Guide

19
Enabling IGMP snooping
When you enable IGMP snooping, follow these guidelines:
• Enable IGMP snooping globally before you enable it for a VLAN.
• If you enable IGMP snooping for a VLAN, do not enable IGMP or PIM on the corresponding VLAN
interface, or vice versa.
• IGMP snooping for a VLAN works on only the ports within 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 Disabled by default.
3. Return to system view. quit N/A
4. Enter VLAN view.
vlan vlan-id N/A
5. Enable IGMP snooping in the
VLAN.
igmp-snooping enable Disabled by default.
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 flood 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 system 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 joins, see "Configuring static ports."
To specify the version of IGMP snooping:
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
IGMPv2 snooping by default.