AIS AI2524 user manual Configure an Datagram Transport, No x25 linkrestart

Chapter 12: AI2524 X.25 Configuration Steps

Disable Packet-Level Protocol (PLP) Restarts

Configure an

X.25 Datagram

Transport

By default, a PLP restart is performed when the link level resets (for example, when LAPB reconnects). Although PLP restarts can be dis- abled for those few networks that do not allow restarts, do not disable these restarts because doing so can cause anomalous packet layer be- havior.

In interface configuration mode, disable PLP restarts:

no x25 linkrestart

X.25 support is most commonly configured as a transport for data grams across an X.25 network. Datagram transport (or encapsulation) is a cooperative effort between two hosts communicating across an X.25 network. You configure datagram transport by establishing a mapping on the encapsulating interface between the far host's protocol address (for example, IP) and its X.121 address. Because the call iden- tifies the protocol that the virtual circuit will carry (in the CUD field), the terminating host can accept the call if it is configured to exchange the identified traffic with the source host.

Figure 12-1illustrates two routers sending datagrams across an X.25 public data network (PDN).

Figure 12-1: Transporting LAN Protocols across an X.25

Public Data Network (PDN)

August 1997	Page 12-13
2524UM