Cisco IOS Wide-Area Networking Configuration Guide - Free Books

X.25 and LAPB Configuration ExamplesConfiguring X.25 and LAPBencapsulation x25!interface serial 1encapsulation x25!x25 route dest-ext ^38.8261.1000.0150.1000.17 interface Ethernet0 mac 0000.0c00.ff89! Above maps NSAP to MAC-address on Ethernet0!x25 route dest-ext ^38.8261.1000.0150.1000.18 substitute-dest 3110451 interface Serial0! Above maps NSAP to X.121-address on Serial0 assuming the link is over a PDN!x25 route dest-ext ^38.8261.1000.0150.1000.20 interface Serial1! Above specifies cmns support for Serial1! assuming that the link is over a leased lineCMNS Switching over a PDN ExampleThe following example depicts switching CMNS over a packet-switched PDN. Figure 53 illustrates thegeneral network topology for a CMNS switching application where calls are being made betweenresources on opposite sides of a remote link to Host A (on an Ethernet) and Host B (on a Token Ring),with a PDN providing the connection.Figure 53Example Network Topology for Switching CMNS over a PDNHost AMAC address 0800.4e02.2abc38.8261.1800.0150.0010.0000.17EthernetSerial X.121 address 4085551234Token Ring 0 MAC address 0000.0c00.ff89Router C2T0S0Router C1PDNS1E0Serial X.121 address 2095551000Ethernet 0 MAC address 0000.0c00.130962855TokenRingHost BMAC address 0800.4e02.1f9f38.8261.1700.0150.0029.8431.02The following configuration listing allows resources on either side of the PDN to call host A or host B.This configuration allows traffic intended for the remote NSAP address specified in the x25 routecommands (for the serial ports) to be switched through the serial interface for which CMNS isconfigured.74