[HECnet] Network topology according to MIM.

problem. I can't speak for Peter, but all I want from the circuit costs is two things - * The routing should be symmetrical; that is, if you ask node A for the path to node B, the result should be the same as if you ask B for the path to A. This isn't an absolute DECnet requirement, but it makes network problems so much easier to figure out when data is taking the same path in both directions. Besides, in HECnet I can't really think of a good reason to prefer an asymmetrical route, so when you find one it almost always means something is configured wrong somewhere. * If two nodes, A and B, have a direct point to point link (probably via Multinet, but maybe something else) then that should be the preferred route between those two nodes. Other nodes besides A and B are another matter, but two nodes that are directly linked should use that link. This seems obvious on the surface - if the owners of A and B didn't want that result, why set up the direct link in the first place? Besides, any esoteric network principles aside, common sense says that a direct path between two nodes is faster and more reliable than a link that goes thru a third party, e.g. psilo. If we were consistent across HECnet about setting network costs, then I'm pretty sure those two things could be accomplished. Bob