SW1#show interfaces fa0/1įastEthernet0/1 is up, line protocol is up (connected) In my opinion, a network engineer must know the “show interface” in depth indeed, this command is useful to obtain various interface information like a drop, duplex mismatch, error, tx/RX loads, …Usually, the IOS switch/router have a similar “show interface” output the differences are dictated by devices, interface, and IOS.īelow a show interface of a FastEthernet interface. If you don't know what's really going on with the interfaces on your Cisco routers/Switches, then you likely don't know which changes you need to make.
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