Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!mailrus!cornell!uw-beaver!apollo!brezak
From: brezak@apollo.uucp (John Brezak)
Newsgroups: comp.protocols.iso
Subject: Transport routing issues
Message-ID: <3d63cf41.1223a@apollo.uucp>
Date: 21 Jul 88 22:46:00 GMT
Organization: Apollo Computer, Chelmsford, MA
Lines: 24

Maybe someone has some ideas on this. If you have a transport layer (TP4) that can
work over different networks, how do you know which network to send something
over ?

                           ( transport user )
                                  |
                        +---------------------+
                        |     Transport       |
                        +---------------------+
                           |               |
                           |               |
                +---------------+  +----------------+
                |      CLNS     |  |     X.25       |
                +---------------+  +----------------+

This seems like a valid profile. And is referenced in US GOSIP. I know that each
network would have a different NSAP. But how does the transport layer know which
network that the destination PDU has to go through ?


-- 
============================================================================================
    John Brezak                   UUCP: {mit-eddie,yale,uw-beaver}!apollo!brezak
    Apollo Computer Inc.          ARPA: brezak@apollo.com
    Chelmsford, MA                Phone: (617) 256-6600