From: CCIEin2006 (ciscocciein2006@gmail.com)
Date: Tue May 16 2006 - 16:46:37 ART
Awesome - thanks.
Now if the problem was between the service provider's frame relay switches
would they be able to provide you a loop from there as well or does your
visibility end at your connection to the frame relay switch?
Is the carrier pretty good at finding problems between the frame relay
switches? I know with point to point T1's they often blame the customer's
equipment until you can prove them wrong with loopback testing.
On 5/16/06, Robert Watson <watson.robert@gmail.com> wrote:
>
> Troubleshooting Frame-relay circuits in the real world is a little
> different. You would want to run your loopbacks if your not seeing LMI
> from
> the provider frame switch. If LMI is down have your provider first
> attempt
> a loop to the smartjack and run several patterns when looped. IE qasi all
> 1's and 0's etc. If this is successful then reconfigure your interface
> for
> HDLC and do 2 things, 1rst plug hard loop into t1 card and run your
> extended ping test off cisco's t1 troubleshooting page then drop the plug
> normalize the circuit and see if you provider can loop the csu. If step 1
> fails replace the t1 card/open tac case. If step 2 fails and your
> condition is provider can loop smartjack but not csu and you have proved
> out
> your t1 card look at physical layer issues such as cabling/ extended
> demarc
> or possible polarity being reversed out of the smartjack to the 48c
> biscuit
> at the bottom of the card (reverse polarity will still result in
> successful
> loop as they just run back to themselves by simulating closed pairs.).
>
> This is assuming that all your settings match up with th circuit like ...
> Framing
> Linecode
> Channels
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> CCIEin2006
> Sent: Tuesday, May 16, 2006 9:11 AM
> To: ccielab@groupstudy.com
> Subject: OT - Frame Relay Troubleshooting in the Real World
>
> Gents,
>
> When troubleshooting frame-relay circuit failures in the real world, is it
> possible to do loopback tests as you would do with a plain T1 with HDLC
> encapsulation?
> With HDLC encapsulation I know that by putting up different loops in the
> network you can run extended pings to those loops and see which loops run
> dirty.
> Can a similar technique be used for frame-relay? If not how would you
> isolate a circuit failure?
>
> Thanks
>
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