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Chapter 12: AI2524 X.25 Configuration Steps
August 1997 Page 12-13
2524UM
Disable Packet-Level Protocol (PLP) Restarts
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
Configure an
X.25 Datagram
Transport
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 12-1 illustrates 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)