Limiting the Number of Layer 2 Multicast Entries Learned by an Interface

Context

To restrict the number of multicast programs that a user can request, you can configure the maximum number of Layer 2 multicast entries learned by the interface. This configuration limits the multicast data traffic volume on the interface.

In application of IGMP snooping over virtual private LAN service (VPLS), the limit on the number of learned Layer 2 multicast entries can only be configured on an attachment circuit (AC) side interface. The configuration method varies according to the type of AC-side interface.

Procedure

If the AC-side interface bound to a VSI is a VLANIF interface, configure the limit on the number of learned multicast entries on the Layer 2 interface in the corresponding VLAN. For details, see Configuring the Limit on the Number of Multicast Entries Learned by an Interface in "VLAN-based IGMP Snooping Configuration."
If the AC-side interface bound to a VSI is a physical interface that has been switched to Layer 3 mode using the undo portswitch command, perform the following steps to configure the limit on the number of learned multicast entries on the AC-side interface:
1. Run system-view
  The system view is displayed.
2. Run interface interface-type interface-number
  The interface view is displayed.
3. Run igmp-snooping group-limit group-limit vsi vsi-name
  The maximum number of Layer 2 multicast entries learned by the interface is configured.
  
  If the number of Layer 2 multicast entries on the interface already exceeds the configured limit, the number of Layer 2 multicast entries on the interface does not change and the interface cannot learn new Layer 2 multicast entries.