What is The difference between Up , Down and Auto mode for link state?

[Masaru_Ishii]

I have a question.

What is The difference between up, down and auto mode for link state?

I know that Down mode is like shutdown.

But I can't understand The difference between Up and Aut mode.

Please teach for me. 

[reaper · Accepted solution]

in auto mode the interface will only show as 'up' when a peer (like a switch, router or workstation) is connected to the port using a proper Ethernet cable

in up mode, the interface will always show as up (green) even with no host connected to it


hope this helps

[Masaru_Ishii]

That's a big help!

Up mode will put link state into Up state , won't it?

Thank you very much for your help.

[reaper · Accepted solution]

yes, if you set the interface to 'up' it will always be in an up state, even without a network cable in it

[Masaru_Ishii]

I was helped out a lot thanks to you

Thank you very much.