Detecting local and global loops in EVPN fabrics

We've enhanced the duplicate MAC address detection feature to take a configured action when a duplicate MAC address is detected. Loops can occur when provider edge

(PE) devices continuously forward frames back and forth to one another in the same broadcast domain.

To detect and resolve these loops, use the following statements at the [edit routing-instances name protocols evpn duplicate-mac-detection] hierarchy level on your peer devices:

• action

The block option blocks any packet that has the source MAC address or destination MAC address of the duplicate MAC address. The shutdown option shuts down the duplicate MAC address's local interface.

• include-local-moves. This statement tracks duplicate MAC address movements that occur on local interfaces.

To manually clear the duplicate MAC addresses, issue the clear evpn duplicate-mac-suppression command.

To manually recover the interface that was shut down, issue the clear ethernet-switching recovery-timeout command.