問題文
An interface with L2PT enabled, facing a customer site, goes down. The output of show interfaces for that interface reads Disabled, Physical link is Down, and the MAC-REWRITE Error field reads Detected. What happened, and how is the interface brought back?
選択肢
- The interface received a BPDU while BPDU protection was configured on it, and clear error bpdu brings it back.
- The interface saw a frame carrying more tags than its encapsulation allows, so the MAC rewrite that L2PT does on such a frame failed, and the tag stack has to be made shallower.
- The interface learned more MAC addresses than its MAC-limit allows, and it comes back by itself once the entries age out of the table.
- The interface received a frame addressed to the L2PT MAC address, which a customer-facing interface should not see unless the topology or the configuration is wrong, and the state has to be cleared with clear error mac-rewrite.