From: Ahmed Mamoor Amimi (mamoor@xxxxxxxx)
Date: Tue Jul 09 2002 - 20:38:55 GMT-3
http://www.cisco.com/univercd/cc/td/doc/cisintwk/itg_v1/tr1915.htm#xtocid195
572
----- Original Message -----
From: Jean-Francois Vaillancourt <hans@cam.org>
To: <ccielab@groupstudy.com>
Sent: Wednesday, July 10, 2002 2:40 AM
Subject: Spontaneous loopback mode on serial interface???
> Hello,
>
> While doing some dial-backup scenarios I just noticed something
> interesting... If I physically disconnect the serial cable connecting a
> router to a 4000 acting as frame switch, the 4000's serial interface goes
> in loopback mode by itself, and remains so even after reconnection... Had
> me scratching my head for a little while until I noticed the yellow LP
> light on the 4000.
>
> I searched on CCO regarding that behaviour, to no avail. Is that an
> undocumented "feature"?
>
> JF
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