RFC 1376 (rfc1376) - Page 3 of 6

The PPP DECnet Phase IV Control Protocol (DNCP)

RFC 1376                        PPP DNCP                   November 1992


         memory to or from a remote system.  For example, a system
         manager can load an operating system into an unattended, remote
         system.  The complete definition of the Phase IV DNA Load/Dump
         protocol can be found in [3].

      o  DNA Experimental Use
         The Digital Network Architecture (DNA) Experimental Use
         protocol type allows Digital experimental protocols to share a
         data link with other data link clients.  It is for use by
         Digital Equipment Corporation only.

      o  DNA Communications Test
         The Digital Network Architecture (DNA) Communications Test
         protocol is a maintenance protocol for testing the data link
         communications path.  The complete definition of the DNA
         Communications Test protocol can be found in [3].

      o  Digital Protocol X1
         The Digital X1 protocol is a network layer protocol currently
         private to Digital.

   This document defines the NCP for establishing and configuring
   Digital's DNA Phase IV Routing protocol (DECnet Phase IV) over PPP.
   This document applies only to DNA Phase IV Routing messages (both
   data and control), and not to other DNA Phase IV protocols (MOP, LAT,
   etc.).

3.  A PPP Network Control Protocol for DNA Phase IV Routing

   The DNA Phase IV Routing Control Protocol (DNCP) is responsible for
   configuring, enabling, and disabling the DNA Phase IV Routing
   protocol modules on both ends of the point-to-point link.  DNCP uses
   the same packet exchange mechanism as the Link Control Protocol
   (LCP).  DNCP packets may not be exchanged until PPP has reached the
   Network-Layer Protocol phase.  DNCP packets received before this
   phase is reached should be silently discarded.

   The DNA Phase IV Routing Control Protocol is exactly the same as the
   Link Control Protocol [1] with the following exceptions:

   Frame Modifications

      The packet may utilize any modifications to the basic frame format
      which have been negotiated during the Link Establishment phase.

   Data Link Layer Protocol Field

      Exactly one DNCP packet is encapsulated in the Information field



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