Loop detection for VLAN

LD loose mode is used to support a shutdown at the attachment circuit (AC) logical interface (LIF) level instead of at the physical port level.

Note

Loop detection is not supported for bridge domains (BDs).

When a loop is detected on a VLAN and port, only the LIF of the VLAN on the port is shut down, but the physical port still remains up and other VLANs on the port are not affected.

The existing LD loose mode configuration commands support loop detection for VLAN tunnels. In LD loose mode, if the VLAN is mapped to VLAN tunnels and LD is enabled, VLAN tunnels loop detection is supported. Up to 256 LD loose mode instances can be configured.

If a loop is detected from a VLAN tunnel, the following actions can take place:

A RASLog is sent and the tunnel VNI LIFs on which the loop is detected is shut down.
A RASLog is sent but the tunnel LIF is not shut down.