查找 switch 上的各 interface mac address:
https://learningnetwork.cisco.com/s/question/0D53i00000Kt5tlCAB/how-to-see-mac-address-of-the-switch-that-you-are-currently-on
show interfaces | i (.* line protocol is )|(.* address is)
查找主機的 base mac address:
show version | i (.* MAC Address)