[6673] in North American Network Operators' Group
Re: Which RFC?
daemon@ATHENA.MIT.EDU (Susan Roycroft)
Thu Jan 2 12:32:57 1997
Date: Thu, 02 Jan 1997 12:10:36 -0500
From: Susan Roycroft <susanr@cisco.com>
To: amb@xara.net, woody@zocalo.net
CC: nanog@merit.edu
also, 1058, rip RFC 'Entities that use RIP are assumed to use the most
specific information available when routing a datagram.'
susan
Bill Woodcock wrote:
>
>
> > Anyone know *which* RFC says a packets should be routed using
> > the most specific route in a routing table, not (for instance)
> > the first route in the table that matches, or, for instance,
> > using a less specific route that has a better metric?
>
> It might be worth your while to look through the sections of RFC 791
> and subsequent revisions which define the second byte of the IP
> header, which sets the delivery-priority and the class-of-service for
> the packet. The class-of-service (type-of-service?) field lets you
> specify whether you want the shortest, largest, cheapest, or most
> reliable route, those being mutually exclusive. In my experience,
> both fields are set to 0 on just about all packets, which doesn't
> specify any requested class-of-service. That presumably leaves the
> router free to choose any route it likes, at its discretion.
>
> > This is so basic I hardly know where to find it
>
> If the router, in its discretion, chooses to route the packet in the
> wrong direction, that should be easily demonstrated and reasonably
> incontrovertable, no? What's your vendor's argument in favor of
> shipping the packet to a nearby site which isn't associated with your
> destination? I'm kind of curious to hear it...
>
> Who's the vendor? Please humiliate them publicly. :-)
>
> -Bill
>
> ______________________________________________________________________________
> bill woodcock woody@zocalo.net woody@nowhere.loopback.edu user@host.domain.com
--
==============================================================
Susan Roycroft (formerly Susan Holdridge)
cisco Systems, Inc.
Customer Engineering
ccie# 2322
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