问题

How is UPSR and BLSR traffic rerouted

How is UPSR and BLSR traffic rerouted during a protection switch when a complete fiber cable cut occurs?（）

A Traffic is switched from the first node receiving the AIS indication.
B Traffic is switched from the far side of the failure, allowing handshaking to occur.
C UPSR traffic is switched from the terminating node, BLSR traffic is rerouted from the originating node in the ring.
D UPSR traffic is switched from the terminating node, circuit by circuit. BLSR traffic is rerouted from the last reachable node in the ring.

参考答案

参考解析：

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