RE: draft-bonica-tunneltrace-02

[neil.2.harrison@bt.com]

many thanks Ping for your answers.....some additional points below.
regards, Neil

> > -	what is the problem?
> Detect and locate detect data plane failures in LSPs.
NH=> I can buy into the latter (ie locate) for simple connectivity breaks at
least, but I am struggling understanding the initial detection bit.  Are you
saying GTTP is somehow running continuously then?
> 
> > -	what is the impact on customers?
> When there is a problem, without a good application, it may 
> take hours 
> for the operators to figure out where the problem is.... I am pretty 
> sure BT had experienced this in the past. :-)
NH=> OK thanks....I was wondering if there was some new problem that had
arisen, and that's why yourself/Loa were saying this is urgent (hence my
question).  But yes connectivity problems happen...and not just in the past
either.  Big push coming down from above here for increased robustness and
reduced opex...one aspect of which is (i) auto detection of defect (ii) auto
handling of defect.....then we need tools to diagnose/clear.
> 
> > -	how does the operator detect detect the problem in the 
> 1st place?
> Currently, operators read memory dumps from many LSRs to 
> figure out if 
> there is a label mismatch for a LSP.
NH=> I read from this that you have evidence of more than simple
connectivity breaks....is that correct?  I agree this would indeed be a
tedious way to diagnose.
<snipped to end NH>