Re: [PCN] Concensus questions from Thursday's PCN meeting

Hi Steven

Please see that I have included some information into the last bullet:

- There is an ingress-egress aggregate whose traffic is split across
multiple paths via ECMP.
 - Traffic is admitted along this split path.
 - One (or more) of the paths fails.
 - One (or more) of the remaining paths becomes severely congested (for
   example because there is traffic from other ingress-egress 
 aggregates flowing along that path).
- <<Due to the ECMP routing not congested paths will forward packets
belonging to 
  the same ingress-egress-aggregate that will be unmarked.>> Marked packets
are 
  preferentially dropped at the severely congested
  router(s). As a consequence, not enough marked traffic arrives at the
egress router to drive the CLE for the ingress-egress aggregate above
the threshold needed to trigger a response (termination, say).

Best regards,
Georgios

> -----Original Message-----
> From: Steven Blake [mailto:steven.blake@ericsson.com] 
> Sent: woensdag 19 maart 2008 16:17
> To: Georgios Karagiannis
> Cc: pcn@ietf.org
> Subject: Re: [PCN] Concensus questions from Thursday's PCN meeting
> 
> Georgios,
> 
> Let me try to paraphrase the scenario you are describing:
> 
> - There is an ingress-egress aggregate whose traffic is split across
>   multiple paths via ECMP.
> - Traffic is admitted along this split path.
> - One (or more) of the paths fails.
> - One (or more) of the remaining paths becomes severely congested (for
>   example because there is traffic from other ingress-egress 
> aggregates
>   flowing along that path).
> - Marked packets are preferentially dropped at the severely congested
>   router(s).  As a consequence, not enough marked traffic 
> arrives at the
>   egress router to drive the CLE for the ingress-egress 
> aggregate above
>   the threshold needed to trigger a response (termination, say).
> 
> Does this description accurately capture your scenario?
> 
> 
> Regards,
> 
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> Steven Blake                <steven.blake@ericsson.com>
> Ericsson/Redback Networks               +1 919-472-9913
> 

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