[HECnet] Network topology according to MIM.

On 2016-01-15 06:30, Robert Armstrong wrote: Well, the problem with that is that you (I think) and Peter have been believing that you have a problem that can be solved by playing with costs in a way that will not solve the problem. You are essentially hitting up against a problem with DECnet routing, and you can never get this optimal. It is just not possible. And the reason is because of how DECnet work. Tweaking your costs to always favor multinet point-to-point links will sometimes turn out better, and sometimes worse. Just like the other way around. Like I just pointed out in my connection to area 59. Wether the ethernet link, or my ptp link is preferrable depends on where I would like to go in area 59, and the topology of area 59. And those two things are something that MIM can never know. Now, I can know where I usually want to communicate to in area 59, but I still don't know which ingress to area 59 is better for that purpose. And any cost Peter might put on *anything* in area 59 will not change that, since all those costs are invisible to anyone outside area 59. And also, optimal would actually suggest that I should use different ingress points into area 59 depending on where to I am communicating, but DECnet cannot do that. All traffic to area 59 from MIM will always go through the same path, no matter what. But in general, I would agree that it's always hard to make a large group of people agree on anything, yes. :-) Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol