On Wed, 2 Dec 2015, Paul Jakma wrote:
+The BGP @acronym{MED, Multi_Exit_Discriminator} attribute is a
+non-transitive attribute, intended to allow one AS to indicate preferences
+for ingress points to another AS.
+Unfortunately, this behaviour means MED can cause the order of preference
+over all the routes to become undefined. That is, given routes A, B, and C,
+if A is preferred to B, and B is preferred to C, a defined, transitive order
+of preference should mean that A is preferred to C.
Sigh. I probably should make it clear that the transitive in the first
relates to how BGP uses that term, and the second as to how maths uses it
in the context of orders, shouldn't I? Or is that not too confusing?
regards,
--
Paul Jakma [email protected] @pjakma Key ID: 64A2FF6A
Fortune:
Under any conditions, anywhere, whatever you are doing, there is some
ordinance under which you can be booked.
-- Robert D. Sprecht, Rand Corp.
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