The best way to do this is build yourself a T1 or 56
cross-over plug and set the clocking to internal. You
can use loopback commands to do it as well but I
prefer external plug which is a more complete test
IMHO (traffic leaves the interface and comes back).
Set encaps to HDLC.
--- "Bullock, Jason (1125)" <[EMAIL PROTECTED]>
wrote:
> Hey Listers.
>
> I was thinking about this cool thing one of the
> cisco TAC engineers did when
> helping me troubleshoot a tricky network problem a
> few months ago. They
> looped up my serial interface on a 2600 to verify
> the WIC card was working
> properly, and that the attached CSU was not faulty.
> They configured the WIC
> interface to show up and up , even though there T1
> was down.
> The problem is , I can not remember the command sets
> that were run to make
> this work. ! Anyone know this one? ugh.
>
> jason
>
>
> -----Original Message-----
> From: Tony van Ree
> To: David A. Lauer; [EMAIL PROTECTED]
> Sent: 3/19/2001 4:17 PM
> Subject: RE: loopback test
>
> Hi,
>
> If you want to check your protocol stack you should
> be able to ping
> yourself, check you ip interfaces and/or check your
> route table
> (assuming IP is used). There are a number of
> utilities that check
> network cards.
>
> Teunis
> Hobart, Tasmania
> Australia
>
>
> On Monday, March 19, 2001 at 07:56:26 AM, David A.
> Lauer wrote:
>
> >
> > Why would you need to? Do you have a link light
> at the interface port
> and
> > the hub/switch? Does the interface show Interface
> UP line Protocol
> up?
> >
> > Cat 5 ethernet uses the 568B pinout for the RJ45
> connectors. You
> could
> > create loopback plug by cross-connecting pins 1-3
> and 2-6.
> >
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of
> > zd z
> > Sent: Monday, March 19, 2001 4:26 AM
> > To: [EMAIL PROTECTED]
> > Subject: loopback test
> >
> >
> > Is there any one knows how to do the
> > loopback test on ethernet or fastethernet port ?
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