7.2 Configuring X.25
7.2.2 Configuring the X.121 address
The x25 address command defines the local router X.121 address (one address per interface). The value specified must match the address designated by the X.25 PDN:

Router(config-if)#x25 address x.121-address

The x25 map command provides a static conversion of higher-level addresses to X.25 addresses. The command correlates the network-layer addresses of the peer host to the X.121 address of the peer host:

Router(config-if)#x25 map protocol address x.121-address [options]

Table describes the x25 map command.

If you try to communicate with a host that understands multiple protocols over a single VC, use the following x25 map command:

Router(config-if)#x25 map protocol address [protocol2 address2]* x.121-address [options]

This communication requires the multiprotocol encapsulations defined by RFC 1356. In the preceding x25 map command, the * means that a maximum of nine network protocol addresses may be associated with one host destination in a single configuration command.

Bridging is not supported with the x25 map command. To bridge a protocol over X.25, use the x25 map bridge command.