Cisco IOS Wide-Area Networking Configuration Guide - Free Books

Configuring X.25 and LAPBConfiguring Additional X.25 Datagram Transport FeaturesNoteIf you specify both ip and compressedtcp in the same x25 map compressedtcp command, they mustboth specify the same IP address.To set up a separate VC for X.25 THC, use the following command in interface configuration mode:CommandRouter(config-if)# x25 map compressedtcp ip-address [protocol2 address2[...[protocol9 address9]]] x121-address [option]PurposeAllows a separate VC forcompressed packets.Configuring X.25 BridgingCisco IOS transparent bridging software supports bridging over X.25 VCs. Bridging is not supported forRFC 1356 operation. Bridge maps must include the broadcast option for correct operation.To enable the X.25 bridging capability, use the following command in interface configuration mode:CommandRouter(config-if)# x25 map bridge x121-address broadcast [option]PurposeDefines bridging of X.25 frames.Configuring Additional X.25 Datagram Transport FeaturesThe Cisco IOS software allows you to configure additional X.25 datagram transport features, includingvarious user facilities defined for X.25 call setup.This section describes the X.25 datagram transport features you can configure by using the options inthe x25 map or x25 pvc encapsulation command (or by setting an interface default). The tasks youperform depend upon your needs, the structure of your network, and the requirements of the serviceprovider.To configure the optional parameters, user facilities, and special features, perform one or more of thetasks described in the following sections:• Configuring X.25 Payload Compression• Configuring the Encapsulation VC Idle Time• Increasing the Number of VCs Allowed• Configuring the Ignore Destination Time• Establishing the Packet Acknowledgment Policy• Configuring X.25 User Facilities• Defining the VC Packet Hold Queue Size• Restricting Map Usage25