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Re: CSPF-C=SPF?

  • From: "Carlos Patriawan" <carlos@carlos.net>
  • Date: Fri, 7 Nov 2003 22:00:32 -0800
  • Cc: <mpls-ops@mplsrc.com>
  • Resent-Date: Sat, 8 Nov 2003 01:45:25 -0500
  • To: <Devendra.Vyas@relianceinfo.com>, "Jean Philippe Vasseur" <jvasseur@cisco.com>
  • X-Sent: 8 Nov 2003 06:01:32 GMT


----- Original Message ----- 
From: "Jean Philippe Vasseur" <jvasseur@cisco.com>
To: <Devendra.Vyas@relianceinfo.com>
Cc: <mpls-ops@mplsrc.com>
Sent: Friday, November 07, 2003 5:45 AM
Subject: Re: [MPLS-OPS]: CSPF-C=SPF?


> At 06:32 PM 11/7/2003 +0530, Devendra.Vyas@relianceinfo.com wrote:
>
> >in the abscence of
> >*Administrative groups (that is, link color requirements)
> >*Priority (setup and hold)
> >*Explicit route (strict or loose)
> >i.e., without any constraints>>
> >is the CSPF path=IGP path??
>
> if you do not have any constraint, yes, CSPF will select the IGP shortest
> path, with the appropriate metric (could be the TE metric or the IGP
metric)
>
> JP.
>

This is implementation specific.

Some vendor may force unconstrained cspf output to be equal with IGP best
path,while other vendor can give different path for load-balancing reason,
for example if least-fill or most-fill link bw is used in cspf computation.

Both are valid.


Thanks,



Carlos


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