When you select X.25 as a WAN
protocol, you must set appropriate interface parameters.
Interface tasks are as
follows:
- Define the X.25
encapsulation (DTE is the default).
- Assign the X.121 address (usually
supplied by the PDN service provider).

- Define map statements to
associate X.121 addresses with higher-level protocol addresses.
Other configuration tasks can be performed
to control data throughput and to ensure compatibility with the
X.25 network service provider. Commonly used parameters include
the number of VCs allowed and packet size negotiation.
X.25 is a flow-controlled protocol. The
default flow-control parameters must match on both sides of a
link. Mismatches because of inconsistent configurations can cause
severe internetworking problems.
Note: Before
configuring X.25 parameters, you must enter interface
configuration mode and assign a higher-layer address, such as an
IP address to the interface.
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