RE: [bmwg] Comments on draft-ietf-bmwg-igp-dataplane-conv-meth-00 .txt

Convergence time when traffic goes from backup path to preferred path should
be a separate metric.  In past tests, we were toggling the preferred path
status up and down.  We notice that the convergence times were different.  I
do not have an explanation for why failure was different than restore.  This
asymmetrical convergence time was observed on several different routers.

Jerry.
___________________________________________________________ 
Jerry Perser                         Spirent Communications
Director of Test Methodology         SmartBits Division 
Phone: 818.676.2320                  26750 Agoura Road 
Lab:   818.676.2337                  Calabasas, CA, 91302 
Cell:  818.292.6457                  Corp:  818.676.2300

> -----Original Message-----
> From: Thomas Eriksson [mailto:thomas.a.eriksson@teliasonera.com]
> Sent: Thursday, July 24, 2003 8:04 AM
> To: bmwg@ietf.org
> Subject: [bmwg] Comments on
> draft-ietf-bmwg-igp-dataplane-conv-meth-00.txt
> 
> 
> Here are some comments on 
> draft-ietf-bmwg-igp-dataplane-conv-meth-00.txt.
> 
> The draft is focusing mainly on convergence time when things 
> break. It may 
> also be interesting to study the convergence time when 
> traffic goes from 
> backup path to preferred path.
> 
> An interesting test case is when ECMP is used on the SUT and 
> we want to 
> benchmark convergence time. I do not think that the current 
> methodology 
> will work for this case because some traffic will go over the 
> "backup path" 
> as well. This could be fixed by measuring the traffic on the 
> "prefered 
> path" and when this traffic is rerouted to the "backup path" 
> calculate 
> convergence time based on that. I am not sure however is if 
> is possible to 
> produce comparable results when using ECMP ? (I guess it somewhat 
> implementation dependent function).
> 
> Thomas
> 
> 
> _______________________________________________
> bmwg mailing list
> bmwg@ietf.org
> https://www1.ietf.org/mailman/listinfo/bmwg
> 

_______________________________________________
bmwg mailing list
bmwg@ietf.org
https://www1.ietf.org/mailman/listinfo/bmwg