IBM SC30-3681-08 Chapter 26. Using the X.25 Network Interface

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 speciﬁcations 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:

v“Basic Conﬁguration Procedures”

v“X.25 Support Over ISDN BRI D-Channel (X.31)” on page322

v“Null Encapsulation” on page 322

v“Understanding Closed User Groups” on page324

For information on conﬁguring X.25 Transport Protocol (XTP) for transporting X.25

traffic over TCP/IP,see “Chapter 28. Using XTP” on page 361.

For information about X.31 traffic, see “X.31 Support”on page 626.

This section outlines the minimal conﬁguration 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

conﬁguration commands described in this chapter.

Note: Youmust restart the router for the conﬁguration 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

The X.25 address is a unique X.121 address that is used during call

establishment. For DDN networks, use the add htf-addr and the set htf-addr

commands 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-type and specify whether the frame and packet levels act

as DCE or DTE. The default for this command is DTE.

8. Type set svc and deﬁne the lowest and highest SVCs that you are using. The

default is for 1 SVC.