mailing list archives
Re: metric 0 vs 'no metric at all'
From: Danny McPherson <danny () tcb net>
Date: Tue, 3 Jan 2006 07:49:29 -0700
On Jan 3, 2006, at 1:03 AM, Daniel Roesen wrote:
So the spec is fuzzy about how "no MED vs. MED=0" should be
vendors seem to largely agree to "no MED == MED 0". I know of no
deviation, except the old ERX bug which got fixed (ERX treated "no
as best, even better than MED=0 - contrary to documentation).
I recall some earlier implementations from "well known" vendors that
had varying behavior for MED processing as well.
Fortunately, the update to RFC 1771:
is considerably more explicit about this behavior, as well as a slew
of other previously-left-to-the-implementation items ironed out
through a great deal of implementation and deployment experience.
The "BGP Experience" and "BGP MED Considerations" Internet-
drafts provide a good bit of additional insight into some of these