Which RFC?

Susan Roycroft 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
> ______________________________________________________________________________
> bill woodcock woody at zocalo.net woody at nowhere.loopback.edu user at host.domain.com

Susan Roycroft (formerly Susan Holdridge)
cisco Systems, Inc.
Customer Engineering
ccie# 2322

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