Subject: RE: [Ospf-wireless-design] Re: consensus

From: "Spagnolo, Phillip A" <[email-masked]>
Date: Fri, 4 Nov 2005 06:48:14 -0800

Emmanuel,

You have stated the following on several occasions.

> One thing that must be considered though, is the stretch 
> factor that is 
> implied by the topology reduction scheme going
> with MDRs. We are currently at INRIA running some simulations to 
> evaluate this stretch factor. It seems it may be
> quite substantial, and this should be taken into account in 
> the design, 
> as route stretching introduces an overhead that
> is proportional to the data traffic. On the other hand using 
> MPR/MPRselector adjacencies does yield more adjacencies,
> but no route stretching whatsoever. So here (in the topology 
> reduction 
> design) there is a trade-off that was not yet fully
> discussed in my opinion.

Why do you say that MDRs require much longer routing stretch?  It has
been pointed out several times that when using MDR Full or Min-hop LSAs
then route stretch is minimized in OSPF-MDR.  

For some reason, it seems that you want to force data packets and ospf
packets over the same path.  

Are the simulations that you are running forcing data packets over the
CDS backbone?  If they are then your comparison does not seem to be on a
level playing field.

Let me know if I am confused in some way, or I don't have all the
information.  

Sincerely,
Phil

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