Decnet Routing Service - HP 200 Series Services And Applications

DECnet Routing Service

The HP routers support DECnet Phase IV routing services. Unlike IP, IPX,
AppleTalk, and XNS routing services, source-routing support is not provided
for the DECnet routing service. The HP routers implement the DECnet
routing protocol (DRP), the network-layer protocol of the Digital Network
Architecture (DNA). DEC systems support several other network architec-
tures, including:
Local Area Transport Architecture (LAT): proprietary DEC
architecture for terminal servers on Ethernet networks. LAT
protocol is a direct user of Ethernet service.
Maintenance Operations Protocol (MOP): implemented on diskless
nodes, such as the MicroVAX 2000, for downloading their operating
systems. MOP is a direct user of the data-link layer services.
System Communications Architecture (SCA): also known as "VAX
clusters", uses System Communication Services protocol at the
network layer. This architecture allows multiple computers to share
disk drives over Ethernet at 10 Mbit/s or over the Computer
Interconnect (CI) bus at 70 Mbit/s.
DECnet/OSI Architecture: DEC's implementation of the Open
Systems Interconnect (OSI) protocols for DECnet Phase V. It uses
ISO (International Standards Organization) network-layer protocols.
It is not uncommon to see DECnet (DNA), VAX clusters, and LAT all
providing services on a single Ethernet. Note that only DNA-compatible
products—HP routers for example—implement DECnet routing protocol.
The DECnet routing service on HP routers can only be used for
communication between networks if the communicating devices are
DNA-compatible. Otherwise, the bridging service must be used. HP routers
will support OSI routing in the near future.
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