susanr at cisco.com
Thu Jan 2 17:10:36 UTC 1997
also, 1058, rip RFC 'Entities that use RIP are assumed to use the most
specific information available when routing a datagram.'
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 woodcock woody at zocalo.net woody at nowhere.loopback.edu user at host.domain.com
Susan Roycroft (formerly Susan Holdridge)
cisco Systems, Inc.
More information about the NANOG