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HDLC debug output not available after IOS 15.7 upgrade

I recently upgraded my 2951 Router from IOS 15.4 to 15.7.  Before the upgrade, I woud type

debug serial int

to get the HDLC debug output

and I would get the following debug output

 

HDLC myseq 6, mineseen 6*, yourseen 7, line up

 

Now, after the upgrade, I can't get those debug messages anymore.  Any ideas?

 

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Re: HDLC debug output not available after IOS 15.7 upgrade

It wasn't a problem, specifically, with the debugging system.



It turns out, that in upgrading to the newer version of the firmware, the ignore-dcd setting became unset at some point. I need to ignore that signal, because there is inline crypto that brings the interface down until it has re-synchronized with it's peer. Once I set that to true, the keepalive messages began to run continuously as expected.



Thanks.


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2 REPLIES 2
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VIP Mentor

Re: HDLC debug output not available after IOS 15.7 upgrade

Hello,

 

is it possible that the default encapsulation on serial interfaces has changed from HDLC to PPP in that release ?

Highlighted

Re: HDLC debug output not available after IOS 15.7 upgrade

It wasn't a problem, specifically, with the debugging system.



It turns out, that in upgrading to the newer version of the firmware, the ignore-dcd setting became unset at some point. I need to ignore that signal, because there is inline crypto that brings the interface down until it has re-synchronized with it's peer. Once I set that to true, the keepalive messages began to run continuously as expected.



Thanks.


View solution in original post