Configuring Layer 2 Multicast Instances for VLAN or VSI Users

If users in different VLANs or VSIs request for the same group's data from the same source, configure a Layer 2 multicast instance on a device, allowing the device to request for only one copy of each multicast data flow for such users from the upstream device.

Context

To implement inter-VLAN or inter-VSI multicast traffic replication, configure a Layer 2 multicast instance, and then associate a multicast instance with one or more user instances in Layer 2 multicast instance view.

For the same Layer 2 multicast instance, the multicast and user instances can be VLANs, VSIs, or a combination of them.

For VLAN users, the multicast and user instances must be VLANs.
For VSI users, the multicast instance must be a VSI, and the user instances can be either VSIs or VLANs.

To facilitate service management, multicast content providers generally operate different types of channels in different Layer 2 multicast instances. If this is the case, channels need to be specified for Layer 2 multicast instances.

Procedure

Configure a Layer 2 multicast instance for VLAN users.
1. Run system-view
  The system view is displayed.
2. Run vlan vlan-id
  The VLAN view is displayed.
3. Run igmp-snooping enable
  IGMP snooping is enabled for the VLAN.
  
  Enable IGMP snooping only for the VLAN to be configured as the multicast instance.
4. Run quit
  The system view is displayed.
5. Run l2-multicast instance instance-id
  A Layer 2 multicast instance is created, and the instance view is displayed.
6. Run import-channel group-address { mask | mask-length }
  A multicast channel is specified for the Layer 2 multicast instance.
  
  After this step is performed, the instance forwards multicast data only for this channel.
7. Run multicast-instance vlan vlan-id
  A VLAN is configured as the multicast instance for the Layer 2 multicast instance.
8. Run user-instance vlan { vlan-id [ to vlan-id ] } &<1-10>
  VLANs are configured as user instances for the Layer 2 multicast instance.
  
  Multiple user VLANs can be configured for a Layer 2 multicast instance, but a VLAN cannot be configured as both a multicast instance and a user instance.
Configure a Layer 2 multicast instance for VPLS users.
1. Run system-view
  The system view is displayed.
2. Run igmp-snooping enable
  IGMP snooping is enabled globally.
3. Run vsi vsi-name
  A VSI is created, and the VSI view is displayed.
4. Run igmp-snooping enable
  IGMP snooping is enabled for the VSI.
  
  Enable IGMP snooping only for the VSI to be configured as the multicast instance.
5. Run quit
  The system view is displayed.
6. Run l2-multicast instance instance-id
  A Layer 2 multicast instance is created, and the instance view is displayed.
7. Run import-channel group-address { mask | mask-length }
  A multicast channel is specified for the Layer 2 multicast instance.
  
  After this step is performed, the instance forwards multicast data only for this channel.
8. Run multicast-instance vsi vsi-name
  A VSI is configured as the multicast instance for the Layer 2 multicast instance.
9. Run user-instance { vsi vsi-name | vlan { vlan-id [ to vlan-id ] } &<1-10> }
  VLANs or VSIs are configured as user instances for the Layer 2 multicast instance.
  
  Multiple VLANs or VSIs can be configured as user instances for a Layer 2 multicast instance, but a VLAN or VSI cannot be configured as both a multicast instance and a user instance.