Compatible Systems RISC Router 3500R Bedienungsanleitung PDF herunterladen (Seite 2)

DECrouter 250, Version 1.1 SPD 32.15.02

The DECrouter 250 (DSRVR) hardware has two high

speed serial ports and six low speed serial ports. The

DEC WANserver 150 hardware has one high speed se-

rial port and one low speed serial port. The low speed

ports operate at up to 19.2 Kbps, and conform to CCITT

V.28/V.24 (EIA-232-D). The high speed ports operate

at speeds up to 64 Kbps and support CCITT V.36/V.11

(EIA-449/422), CCITT V.10 (EIA-449/423), CCITT V.35

Appendix A, as well as CCITT V.28/V.24 (EIA-232-D).

In asynchronous mode all ports operate at 19.2 Kbps

maximum.

The DECrouter 250 software with the DECrouter 250

hardware supports eight lines at speeds and conﬁgura-

tions of 2x64 Kbps, or 1x64 Kbps and 4x9.6 Kbps, or

8x19.2 Kbps.

The DECrouter 250 software with the DEC WANserver

150 hardware unit supports two lines at speeds and

conﬁgurations of 1x64 Kbps and 1x9.6 Kbps, or 2x19.2

Kbps.

Adapter cables provide the necessary interchange cir-

cuits for the high speed ports. Refer to the System Sup-

port Addendum (SSA 32.15.02-x) for further information

on the required adapter cables.

Installation and Conﬁguration

The DECrouter 250 software is installed and conﬁgured

on a VMS, ULTRIX (VAX or RISC), or MS-DOS®/PC-

DOS system (termed a load host).

The appropriate DECrouter system image is downline

loaded from the load host into the memory of the DEC-

router 250 or DEC WANserver 150 hardware units. This

system image can be downline loaded over the serial

communications ports, as well as the Ethernet/802.3

ports. It should be noted, however, that some load hosts

will not support downline loading over serial communi-

cations ports.

To identify which devices on a load host will provide

support for serial-line loading, refer to the correspond-

ing DECnet Software Product Description for that host.

(DECnet-VAX SPD 25.03.xx and DECnet-ULTRIX SPD

26.83.xx.)

Each DECrouter 250 and DEC WANserver 150 hard-

ware unit will have a separate system image on a load

host.

The DECrouter 250 software contains the conﬁguration

information that tailors the dedicated router system for

proper operation in its intended environment.

The conﬁguration information contained in the system

image on the load host can be modiﬁed by the Sys-

tem/Network Manager using a utility provided on the in-

stallation kit. The changes made to the conﬁguration

information in the system image are retained until the

conﬁguration utility is used to modify those changes.

The changes take effect the next time the system im-

age is downline loaded to the DECrouter 250 or DEC

WANserver 150 hardware.

Network and Conﬁguration Management

The Network Management Utility (DECnet Network

Control Program (NCP)) on Phase IV DECnet hosts can

execute commands remotely with the DECrouter 250

software to perform three primary functions:

• Display statistical and error information for the router

(for example, statistics on line usage or errors)

• Control the operation of the router (for example, start-

ing and stopping lines, setting parameters, and load-

ing software)

• Test the components of the network (for example,

loop messages through all or part of a communica-

tions path to isolate a defective component)

The DECrouter 250 software also has a monitor that is

available both locally and remotely. The remote monitor

runs on VMS, ULTRIX (VAX or RISC), and MS-DOS/PC-

DOS host systems to monitor the current state of the

router. These displays are updated at pre-set intervals

and present current router data and status information

such as CPU and line utilizations, current adjacencies,

and buffer use.

Path Splitting

If the costs are set appropriately, the DECrouter 250

software performs path splitting. Note that routing cost

is an arbitrary network management parameter set by

the network manager to control network trafﬁc ﬂow. If

the cost between the router and the destination node is

the same on multiple asynchronous/synchronous ports,

up to a maximum of four circuits, then the DECrouter

250 software splits trafﬁc across the ports. As a result,

higher data transfer rates and higher reliability due to

redundant paths are provided.

It should be noted that for this path splitting feature to

work, the destination nodes must support out-of-order

packet caching.

Performance

The DECrouter 250 software will support and saturate

the following serial line speeds and conﬁgurations with

minimum size DECnet packets:

1 2 3 4 5 6 7 8

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