IBM SC30-3865-04 Chapter 7. Using DNA IV

Chapter 7. Using DNA IV

This chapter describes IBM’s implementation of Digital Network Architecture Phase

IV (DNA IV) and includes the following sections:

v“DNA IV Overview”

v“IBM’s Implementation of DNA IV”on page 252

v“Conﬁguring DNA IV” on page 261

v“DNA IV Conﬁguration and Monitoring Commands”on page 265

DNA IV is a collection of software components that transfer information between

networks connected by physical media. By transferring information, DNA IV

software facilitates communication between network devices, such as personal

computers, ﬁle servers, and printers.

DNA IV protocol is the underlying protocol for Digital Equipment Corporation’s

DECnet software products as well as DNA-compatible products. DNA IV protocol

includes the following:

vRouting software for DNA IV protocol networks.

vNCP,an implementation of the DNA IV Network Control Program. For more

information, refer to the appropriate DECnet-VAX documentation, published by

Digital Equipment Corporation.

vSupport for DNA IV Maintenance Operations Protocol (MOP).

DNA IV performs two major functions:

vMaintains a complete routing database on all nodes in its area. (If the router is

operating as a level 2 router, it maintains the database for all areas as well.)

vRoutes incoming DECnet data packets to the appropriate destinations based on

its own routing database. It ignores packets that are addressed to the router that

are not hello packets or routing packets.

DNA IV supports the following:

vMultiple areas on an Ethernet or Token-Ringnetwork.

vBasic MOP operations. DNA IV responds to a MOPRequest ID message with a

MOP System ID message. DNA IV also sends a MOPsystem ID Message when

a circuit comes up. Youcan monitor MOP messages using the Ethernet

conﬁguration module under DECnet-VAX NCP.The router NCP does not include

an Ethernet conﬁguration module.

vLATProtocol. LAT protocol is not part of the DNA IV protocol family. It is an

Ethernet-only protocol intended only for short-distance (limited round-trip time)

communications. (CTERM protocol provides wide-area terminal support using

DNA IV protocols across routers. The set host command in DECnet-VAX

provides the CTERM protocol.)

Special consideration should be given to the following DNA IV restrictions:

vDNA IV does not support the NSP,Session, or NICE protocols.

vDNA IV does not support the DDCMP line protocol on its directly connected

synchronous lines.