I think this is because Ethernet / Fast Ethernet interfaces generate their
own keepalives and thus keep themselves up. Serial interfaces receive their
keepalives from the remote end and rely on return communications to bring
the interface up.

Paul


""Tribavan Raina""  wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hi..
>
> When we give no keepalive command on ethernet or fast ethernet ,the port
and
> line protocol come up but when we do the same thing for serial port why
> doesnt it work.
>
> May be it is a silly  question.




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