Subject: Re: Allowing Users to Prefer HPR Routes

From: [email-masked] (Dave Finnie)
Date: Mon, 31 Oct 94 09:16:31 EST

I too have a couple of problems with the suggested HPR route
strategy.

I agree with Mark that this could direct traffic over routes
that are non-optimal. Just because a 64K SDLC line is using HPR
doesn't mean that it is suddenly faster than a 16M T/R that is
not using HPR !

Also - assuming the proposed change went ahead - it appears to be
a bit of an all-or-nothing approach. What happens in the case of
a segmented network (ie one partially converted to HPR protocols) ?
If there is a route that is mostly HPR, but has one or more non-HPR
segments in the middle, shouldn't the "HPR preferred" indicator
allow this route to be chosen if there is no HPR-only route ?
With the current manner in which an HPR route is calculated, the
non-HPR TGs are given infinite weighting, so this route would be
avoided. The subsequent route calculation failure would then result 
in no preferrence for HPR TGs even though this is what is indicated 
in the MODE.

Have I missed something, or do you agree that this is a concern ?

Dave