Version 9.x or not, backwards compatibility has never been a given. I
suppose my reaction is a little knee-jerk, being that the bulk of my
experience is in large enterprise networks. I can't tell you how many times
I've found old routers acting funky- hours or days after a peer upgrade.
Last week I had a 4500 with 11.2(9) start with a EIGRP memory leak because
it was now communicating with a 7513 upgraded to an RSP4/ 12.1 combination
(previously an RSP2 with 11.1).
OK- back to studying :o)
Phil
----- Original Message -----
From: "EA Louie" <[EMAIL PROTECTED]>
To: "John Neiberger" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Friday, March 23, 2001 4:16 AM
Subject: Re: back-to-back serial interfaces
> 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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