Revision/Update Information: This manual supersedes the DECnet/OSI Planning Guide.
Operating Systems:
OpenVMS VAX Version 7.1
OpenVMS Alpha Version 7.1
Digital UNIX Version 4.0
Software Versions:
DECnet-Plus for OpenVMS Version 7.1
DECnet/OSI for Digital UNIX Version 4.0
Digital Equipment Corporation Maynard, Massachusetts
Digital Equipment Corporation makes no representations that the use of its products in the manner described in this publication will not infringe on existing or future patent rights, nor do the descriptions contained in this publication imply the granting of licenses to make, use, or sell equipment or software in accordance with the description.
Possession, use, or copying of the software described in this publication is authorized only pursuant to a valid written license from Digital or an authorized sublicensor.
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© Digital Equipment Corporation 1996. All rights reserved.
The following are trademarks of Digital Equipment Corporation: Bookreader, DDCMP, DEC, DECdirect, DECnet, DECNIS, DECserver, DECsystem, DECwindows, Digital, DNA, InfoServer, OpenVMS, OpenVMS cluster, PATHWORKS, ULTRIX, VAX, VAX DOCUMENT, VAXcluster, VAXstation, VMS, VMScluster, and the DIGITAL logo.
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This book provides an overview of the transition and planning tasks necessary to move from DECnet for OpenVMS (Phase IV) to DECnet-Plus for OpenVMS (Phase V) and DECnet/OSI for Digital UNIX. It describes how to:
See your Software Product Description (SPD) for detailed information about new features and product requirements.
This book is written for:
This book has ten chapters:
For a complete list of companion documents, see the DECnet-Plus for OpenVMS Introduction and User's Guide or DECnet/OSI for Digital UNIX Introduction and User's Guide.
For additional information about the DECnet-Plus products and services, access the Digital OpenVMS World Wide Web site. Use the following URL:
http://www.openvms.digital.com
Digital welcomes your comments on this manual or any of the DECnet-Plus documents. Send us your comments through any of the following channels:
Internet | openvmsdoc@zko.mts.dec.com |
Fax | 603 881-0120, Attention: OSSG Documentation, ZKO3-4/U08 |
OSSG Documentation Group, ZKO3-4/U08
110 Spit Brook Rd. Nashua, NH 03062-2698 |
These terms are used interchangeably:
Use the following table to order additional documentation or information. If you need help deciding which documentation best meets your needs, call 800-DIGITAL (800-344-4825).
The following conventions apply to this book.
Note
The following conventions are for multiplatform documentation.
Convention | Meaning |
---|---|
special type |
Indicates a literal example of system output or user input. In text,
indicates command names, keywords, node names, file names, directories,
utilities, and tools. On a DECnet-Plus for OpenVMS, Digital UNIX, or
ULTRIX
tm system, enter the word or phrase in the exact case shown.
You can abbreviate command keywords to the smallest number of characters that OpenVMS, Digital UNIX, NCL, DECdns, DECdts, and the other utilities accept, usually three characters. |
italic | Indicates a variable. |
text style | Indicates a new term defined either in the text or in the DECnet-Plus for OpenVMS Introduction and User's Guide glossary. |
[Return] | Indicates that you press the return key. |
[Ctrl/] x | Indicates that you press the control key while you press the key noted by x. |
[ ] | In command format descriptions, indicates optional elements. You can enter as many as you want. |
{ } | In command format descriptions, indicates you must enter at least one listed element. |
<> | Indicates the end of platform-specific information. |
Chapters 1 through 4 of this book describe the considerations that will
help you determine how best to transition your network. The following
sections define what the transition is, explain why you would want to
transition your systems from the DECnet Phase IV to DECnet Phase V
architecture, and help you plan how long this transition might take.
1.1 Transition Defined
Transition is the process of migrating a network from DECnet Phase IV to DECnet-Plus (Phase V) by changing:
Transition is a multistep process. Some tasks you perform immediately as part of the DECnet-Plus installation/configuration procedure. Others you do immediately afterwards, still others perhaps later, as your network's needs change. In addition, some steps target the transition of one system, while other steps are part of the network's overall transition to DECnet-Plus.
Transition begins with the installation of the DECnet-Plus software onto the first node in the network. With this installation/configuration, the system becomes a DECnet-Plus system. Your network operates in a transition environment from the transition of the first node until all DECnet nodes migrate to DECnet-Plus.
DECnet Phase IV supports DECnet applications only. It does not support OSI (Open Systems Interconnection) and TCP/IP applications, which must use separate protocol stacks that DECnet Phase IV does not provide.
With DECnet Phase V (formerly known as DECnet/OSI and now, with Version 7.1, DECnet-Plus), your DECnet applications can communicate (without change) with peer OSI and DECnet applications on any system running DECnet Phase IV, Phase V, or OSI software. That system can be a Digital system or one from another vendor. DECnet-Plus integrates the OSI protocol stack with the DECnet protocol stack and includes the ability to run DECnet and/or OSI applications over TCP/IP.
A growing number of emerging network applications are designed to be transported over the Open Systems Interconnection. DECnet-Plus provides a collection of standard OSI applications such as File Transfer, Access, and Management (FTAM) and Virtual Terminal (VT), plus a complete library of OSI transport protocols.
With DECnet-Plus, you can use one or more of the following name services to translate network names to node numbers and back, depending on the transport used (DECnet, OSI, or TCP/IP):
When a user provides a node name to a DECnet or OSI application, the application translates it using the appropriate name service.
TCP/IP support is crucial for the many customers who need access to the TCP/IP-based Internet and to the growing number of low-cost, IP-compatible routers and carrier services. DECnet-Plus, in combination with a Digital or third-party TCP/IP protocol stack for OpenVMS and Digital UNIX, allows a DECnet customer to convert to TCP/IP network protocols without having to give up existing DECnet or OSI applications.
The DECnet over TCP/IP (DOTI) feature (RFC 1859), included with DECnet-Plus, allows DECnet applications to communicate over TCP/IP. The OSI over TCP/IP support (RFC 1006), included with DECnet-Plus, allows OSI applications to communicate over TCP/IP.
For new OpenVMS and Digital UNIX systems, Digital now bundles run-time licenses for DECnet-Plus and TCP/IP services. If you are an existing DECnet support customer, you receive DECnet-Plus automatically but need to purchase a license to use Digital's TCP/IP Services for OpenVMS.
If you want to migrate your system to TCP/IP, you must install and
configure the TCP/IP stack as part of your transition. Both DECnet-Plus
and TCP/IP transports can be up and running concurrently and you can
make the transition to TCP/IP gradually. You do not need to choose
between OSI or TCP/IP. You can even choose to run your DECnet-Plus node
with DECnet Phase IV functionality only and begin to use the OSI and/or
TCP/IP features as you become more familiar with them.
1.1.2 How Long Does Transition Take?
The time it takes to make a complete network transition depends on your strategy. DECnet-Plus software gives you the flexibility to decide how and when to make the transition from Phase IV to DECnet-Plus. No definite time period is prescribed for all networks.
You can choose to make the transition gradually, perhaps installing DECnet-Plus software in a single area first to see how it operates and how to take advantage of its features. Or, you can install DECnet-Plus software on end systems in several areas. For example, you may chose to operate with a mixture of Phase IV and DECnet-Plus software within each area. At some point, you might decide to use the link state routing algorithm and take advantage of OSI addressing that is beyond Phase IV limitations, that is, extended addressing.
Note
The time you spend planning the transition is an essential part of your total transition timeframe.
The time it takes to migrate one system from DECnet Phase IV to
DECnet-Plus is the time it takes to perform the installation and
configuration procedures on this system. However, if this is the first
DECnet-Plus node on the network, you must spend some additional time on
other transition tasks, such as populating the namespace, if you are
creating a DECdns namespace, and converting some Phase IV databases.
1.1.3 What Is the Transition Environment?
During transition, some or all of your network operates in a mixed environment of Phase IV and DECnet-Plus nodes, either spread throughout the network or grouped into all-Phase-IV or all-DECnet-Phase-V areas.
In this transition environment, you have a mixture of Phase IV and
DECnet Phase V features, including addressing, routing, and network
management.
1.1.4 When Do DECnet-Plus Features Become Available?
Most features offered by the DECnet-Plus for OpenVMS and DECnet/OSI for Digital UNIX products become available upon installation and configuration of the product software. However, RFC 1006, RFC 1859, and DNS/BIND require the installation of additional TCP/IP software. DECnet-Plus features include:
Transition from Phase IV to DECnet-Plus ends when all:
Because DECnet-Plus features allow for flexible transition, the network
can operate with a mixture of Phase IV and DECnet-Plus systems for as
long as your network requires. Therefore, as network manager, you
decide how long the network continues to operate in a transition
environment.
1.2 Transition Features
DECnet-Plus software provides the following features to help you during transition:
The DECnet-Plus software supports a new address format, the OSI addressing format. OSI addresses (NSAPs) can be bigger and longer than Phase IV addresses, or they can fall within the limits of Phase IV addressing. OSI addresses that falls within the limits of Phase IV addressing are referred to as Phase IV-compatible addresses. DECnet Phase V addresses that fall outside Phase IV address space are referred to as extended addresses. Refer to Section 4.5 for more information.
Making communication possible between a Phase IV node and a DECnet-Plus system depends on the address of the DECnet-Plus system and on your routing configurations. You have the following options for assigning addresses to DECnet-Plus systems:
The DECnet Phase IV network-address format consists of 16 bits (2 bytes) of information:
This format limits the network to 63 areas and a maximum of 1023 nodes per area. In contrast, the OSI address format can be up to 20 bytes long, thus extending network addresses beyond Phase IV limits.
Table 1-1 lists the differences between Phase IV and OSI addresses. Figure 1-1 shows the address parts listed in Table 1-1. For a complete description of OSI addresses and their individual parts, see Chapter 4.
Phase IV Address | OSI Address |
---|---|
2 bytes long | Up to 20 bytes long |
Consists of two parts:
|
Consists of two parts: |
Area = area number (1 to 63) | Area = IDP + preDSP¹ + LocArea fields in DSP |
Node address = area number + node number |
System address = IDP + preDSP + LocArea + node ID is called the
network entity title (NET).
The NET is the address by which the Network layer is identified. It identifies a particular system in a particular network. |
No transport selection (NSP assumed) |
Provides SEL field for transport selection (NSP or OSI transport).
AN OSI address (NET) that also includes a SEL field other than 00 is a network service access point (NSAP). The NSAP is a global network address. It is the addressable point at which a network entity provides the network service to a network user. It identifies both the particular network system and the transport on that system that is to receive the data. |
Figure 1-1 Examples of Phase IV and DECnet Phase V Addresses
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Copyright © Digital Equipment Corporation 1996. All Rights Reserved.