that is very frightening. Did Cisco release notes show a non-compatability
between the versions? That HDLC 'standard' has been in effect since version
9.x
-e-
----- Original Message -----
From: John Neiberger <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Thursday, March 22, 2001 3:35 PM
Subject: Re: back-to-back serial interfaces
> I had this exact issue a couple of months ago. The problem was that the
> flavor of HDLC in older IOS versions was not playing well with the newer
> versions. I upgraded the older version to a 12.x version and all was
> well.
>
> Regards,
> John
>
> >>> "Richard Wilson" <[EMAIL PROTECTED]> 3/22/01 4:06:55 PM >>>
> Hi
>
> I hate to revisit the old back-to-back serial problem
> but I think I have a new twist. I've researched the
> archives including Pamela's excellent March 15
> response and can't seem to find anything that fits. I
> think my problem is slightly different and I would
> appreciate any insight the group can provide.
>
> I'm running two 2500s with a DCE/DTE cable between
> serial ports. "Show Controller" correctly identifies
> the DCE and DTE ends.
>
> One end is running IOS 11.0(17) and the other end IOS
> 12.0(9). I can switch cable ends and in either case
> the router on the DCE end accepts the "Clock Rate"
> command with no problem.
>
> The twist is that the IOS 12 router accepts the "No
> Shutdown" command and comes up. The 11.0 router
> accepts the command but the line protocol stays down.
> The "Show Interface" command identifies identical
> configurations on both ends including HDLC
> encapsulation.
>
> I'm assuming the difference is the IOS version and I
> can certainly upgrade. Should I encounter this
> problem in the field, however, I would like to
> understand what's going on. Is there an IOS command
> required in the earlier version that isn't required in
> 12?
>
> Thanks in advance
>
> Richard
>
>
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