Chapter 5 Configuring X2T - 3Com 3033 Configuration Manual

For v1.20

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Table of Contents

3Com Router Configuration Guide Addendum for V1.20

The X.25 to TCP switch (X2T) technology can interconnect X.25 and IP networks and

enables access between X.25 and IP hosts.

X.25 Terminal

X.25

LAPB

Figure 5-1 Typical X2T networking

From the perspective of an X.25 host, each IP host is associated with an X.121

address. Whenever the router receives an X.25 call request packet, it examines the

destination X.121 address carried by the packet and looks in its X2T routing table for

a match for the address. If there is a matched route, the router sets up a TCP

connection with the host at the destination IP address of the X2T route. After that, the

router extracts the pure data from the X.25 packet and sends it to the IP host across

the TCP connection.

From the perspective of an IP host, it needs to know only the IP address of the

interface of the router at the IP network side to access an X.25 host. Whenever the

router receives a TCP connection request, it examines the destination IP address and

TCP port number of the TCP connection and looks up the X2T routing table for a

match. If there is a match, the router sets up an X.25 VC destined to the host at the

associated destination X.121 address of the X2T route. After that, the router extracts

the pure data from the TCP packet and sends it to the X.25 host across the X.25 VC.

5.2 X2T Configuration Tasks

Perform the following tasks to configure X2T:

Enable X.25 switching

Configure the interface at the X.25 network side

Configure the interface at the IP network side

Configure X.25 route