[6052] in North American Network Operators' Group
Re: Why doesn't BGP...
daemon@ATHENA.MIT.EDU (Avi Freedman)
Sat Nov 9 13:33:28 1996
From: Avi Freedman <freedman@netaxs.com>
To: edm@halcyon.com (Ed Morin)
Date: Sat, 9 Nov 1996 13:22:31 -0500 (EST)
Cc: neil@easynet.net, deepak@jain.com, nanog@merit.edu
In-Reply-To: <Pine.ULT.3.95.961109093157.14900B-100000@halcyon.halcyon.com> from "Ed Morin" at Nov 9, 96 09:33:54 am
> Look, I can do a "show interface" on any interface and see what speed
> it's running at and if it's dropping packets. If BGP hears a route
> on an interface that isn't dropping packets shouldn't _that_ route
> be considered "best" all other things being equal (hop counts and
> all)? You can't tell me the router doesn't know this information
> because _I_ get the information from the router itself!!
>
> I understand about route instabilities, etc. All I'm talking about
> here is a better "tie breaker" than ordinate numbers of IP addresses.
The router really can't see how fast an interface *can* go unless it's
maxed out. That's not really useful information in a route-selection
decision.
It's possible that the packet loss might weight a better path but you
would have to be careful about reweighting 20k paths every few minutes...
Especially if you pass those decisions on to other routers :)
Avi
