Configuring the ETH-LCK Function for EVPN

As shown in Figure 1, PE1 and PE2 are connected through an EVPN, and CE1 and CE2 are connected to the EVPN through a BD. The MEPs configured on the access interfaces of CE1 and CE2 reside in level-6 MD1. The MEPs configured on PE1 and PE2 reside in level-3 MD2. If the link between PE1 and PE2 fails and the CC is Down, the MEP in level-3 MD2 detects the fault and sends an alarm to the NMS. After a certain period, a MEP in level-6 MD1 also detects the fault and sends the same alarm to the NMS. In this case, you need to configure the ETH-LCK function to prevent the MEP in the high-level MD from sending alarms to the NMS.

To suppress CC alarms from being generated in the outer MD, ETH-LCK is implemented with out-of-service ETH-Test. A MEP in the inner MD with a lower level initiates ETH-Test by sending an ETH-LCK frame to a MEP in the outer MD. Upon receipt of the ETH-LCK frame, the MEP in the outer MD suppresses all CC alarms immediately and reports an ETH-LCK alarm indicating administrative locking. Before out-of-service ETH-Test is complete, the MEP in the inner MD sends ETH-LCK frames to the MEP in the outer MD. After out-of-service ETH-Test is complete, the MEP in the inner MD stops sending ETH-LCK frames. If the MEP in the outer MD does not receive ETH-LCK frames for a period 3.5 times as long as the specified interval, it releases the alarm suppression and reports a clear ETH-LCK alarm.

Figure 1 Networking diagram for configuring the ETH-LCK function of the EVPN