Interface Up with Line protocol down means that keepalives are not being
passed. Default protocol is HDLC, make sure both ends are the same whatever
they are. If they're different - no keepalives.
What are the chances that both modules are bad? We need more info. It's
great to say you've checked something but we can't be sure you checked the
right thing - nothing personal :-)
Kevin Wigle
----- Original Message -----
From: "Ray Smith" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, 13 March, 2001 18:20
Subject: Serial Interface Issues - Help!
> Hey guys,
>
> I have two Cisco 4000 series routers with 4 serial interfaces each (DB60).
> I recently bought some new cables and decided to try out the cables, and
to
> test out the interfaces for the first time since having the routers.
>
> Anyway, whenever I connect either 1 of the 4000 series router to a 2501 or
> the two 4000 series, I notice that the interfaces (seconds after enabling
> the interface)changing to a down state (s0 up, line protociol down and
some
> times s0 down, line protocol down). It is just a simple connection back
to
> back with RIP on the the interface. It is not a clocking issue, because I
> made sure to look into that. I am thinking now that maybe it is the
> intrface modules that is bad ....I could be wrong though. Do you have any
> suggestions.
>
> Ray
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