Chapter 28. Using XTP

This chapter describes the X.25 Transport Protocol (XTP) for transporting X.25 traffic over TCP/IP. Included are the following sections:

vªThe X.25 Transport Protocolº

vªDTE Address Wildcardsº on page 363

vªXTP Backup Peer Functionº on page 364

vªLocal XTPº on page 365

vªXTP and Closed User Groupsº on page 365

vªCon®guring XTPº on page 366

vªCon®guration Proceduresº on page 366

The X.25 Transport Protocol

X.25 Transport Protocol (XTP) provides you with the services of a ªprotocol forwarder.º A protocol forwarder is the focal point for inbound and outbound protocol packet processing. Forwarders receive packets on one network interface and send them to another interface.

XTP is designed to work with X.25 devices that are situated at multiple remote sites. In such environments, XTP can eliminate the use of X.25 packet-switched networks for communicating with servers at one or more centralized locations.

To enable this, you use routers at the server and remote locations to encapsulate the data and deliver the X.25 packets between the clients and server via TCP/IP.

Figure 19 on page 362 illustrates a network con®guration before and after using XTP.

© Copyright IBM Corp. 1994, 1998

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