Excerpts from Scott Brim on Wed, Apr 15, 2009 02:29:10PM -0400: > Excerpts from Noel Chiappa on Sat, Apr 04, 2009 12:35:50PM -0400: > > It may seem that higher-level entities _also_ have locations; e.g. > > if you have a application which is running in a stack has only a > > single interface, that application also 'sort of' has a location. > > Bzzt. If you want to talk about "location" of an application, be very > careful what your layers are, and your layer networks.
I haven't used the term layer network in a while, and I did in this message, so I should explain it. It came out of ITU-T SG15. I'm CCing Malcolm Betts who will answer any questions :-p. A layer network may have all 7 layers of the old X.200 7-layer model. It also has its own point-of-attachment namespace, control, and management. You can stack layer networks, and/or concatenate them. Sonet/SDH is one or more layer networks. ATM is one (iirc ATM has X.200 layers 1-5). IP is a layer network. IMHO single-hop MPLS pseudowires are not a layer network, but multi-hop PWs are. That's because multi-hop PWs added a namespace for points of attachment. Web Services can form a layer network. It even has loose-source routing. swb _______________________________________________ rrg mailing list [email protected] http://www.irtf.org/mailman/listinfo/rrg
