IBM SC30-3681-08 manual Using the X.25 Network Interface, Basic Conguration Procedures, 319

Chapter 26. Using the X.25 Network Interface

The X.25 network interface connects a router to an X.25 virtual circuit switched network. The X.25 network interface software and hardware allows the router to communicate over a public X.25 network. The X.25 network interface complies with CCITT 1980, CCITT 1984, CCITT 1988 and ISO 8208 1990 speci®cations for X.25 interfaces offering multiplexed channels and reliable end-to-end data transfer across a wide area network.

This chapter includes the following sections:

vªBasic Con®guration Proceduresº

vªX.25 Support Over ISDN BRI D-Channel (X.31)º on page 322

vªNull Encapsulationº on page 322

vªUnderstanding Closed User Groupsº on page 324

For information on con®guring X.25 Transport Protocol (XTP) for transporting X.25 traffic over TCP/IP, see ªChapter 28. Using XTPº on page 361.

For information about X.31 traffic, see ªX.31 Supportº on page 626.

Basic Con®guration Procedures

This section outlines the minimal con®guration steps required to get the X.25 interface up and running. The X.25 parameters must be consistent with the X.25 network the interface on the router will connect to. For more information, refer to the con®guration commands described in this chapter.

Note: You must restart the router for the con®guration changes to take effect.

1.At the OPCON prompt (*), type talk 6. The Config> prompt appears.

2.Type list devices to display a list of the interfaces from which you can select. Use the appropriate interface number in the following step.

3.Type set data-link x25.

The Interface Number [0]? prompt appears.

4.Type the appropriate interface number.

5.Connect to the network by typing net # at the Config> prompt. The X.25 Config [#]> prompt appears.

6.At this prompt, type set address x.25-node-address.

The X.25 address is a unique X.121 address that is used during call establishment. For DDN networks, use the add htf-addrand the set htf-addrcommands to convert the protocol address associated with this interface to the X.121 address format required for DDN address translation. Failure to set the network address prevents the X.25 interface from joining the attached network.

7.Type set equipment-typeand specify whether the frame and packet levels act as DCE or DTE. The default for this command is DTE.

8.Type set svc and de®ne the lowest and highest SVCs that you are using. The default is for 1 SVC.

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