Idle chatter about reference models


Michael J. O'Connor (oconnor@sccgate.scc.com)
Fri, 13 Nov 87 20:53:39 EST


Caveat: Since this is idle chatter (see Subject:) the words martian, bogon,
        fuzzball, and playpen will not appear in the body of this message.

        My office-mate just received a colorful poster from CMC comparing
a seven-layer DoD Internet reference model to the seven-layer ISORM. I've
attatched a little chart comparing those two RMs to the old four-layer
ARM [1] for the idly curious.
        The most glaring oddity (aside from typos and a cute phone number)
is the depiction of EGP, GGP and HMP as Transport layer protocols. When I
expressed my surprise at this to my office-mate he wanted to know where they
did belong (magic-marker in hand). My instinctive answer was that EGP and
GGP belonged in the Internetwork layer and that HMP belonged in Massachusetts.
        Since I'm just a hanger-on in this field, I was wondering to which
layer the protocol police would assign EGP and GGP (and their descendants).
I would also like to know if the aforementioned ARM has ever been supplanted.

                                Mike

1. While displaying an affinity for M. Padlipsky's naming scheme (RFC871),
   the four-layer model to which I refer is the one described by B. Leiner,
   et. al. in "The DARPA Internet Protocol Suite".

--------------------------------------------------------
ISORM CMCRM ARM
--------------------------------------------------------
Application Application Application
--------------------------------
Presentation
                Utility
Session
--------------------------------------------------------
Transport Transport Service
--------------------------------------------------------
                Internetwork Internetwork
                                ------------------------
Network Network Network
--------------------------------
Data Link Data Link
--------------------------------
Physical Physical
--------------------------------------------------------



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