Cisco IOS Wide-Area Networking Configuration Guide - Free Books

Configuring Additional X.25 Routing FeaturesConfiguring X.25 and LAPBCommandRouter(config)# service tcp-keepalives-inRouter(config)# service tcp-keepalives-outPurposeEnables received keepalives for TCP sessions to ensure timelydetection of a connection failure.Enables sent keepalives for TCP sessions to ensure timelydetection of a connection failure.TCP keepalives also inform a router when an XOT SVC session is not active, thus freeing routerresources.For examples of enabling keepalives, see the sections “Simple Switching of a PVC over XOT Example”and “PVC Switching over XOT Example” later in this chapter.Configuring X.25 Switching Between PVCs and SVCsIn order for PVC to SVC switching to be configured between two serial interfaces, both interfaces mustalready be configured for X.25. In addition, X.25 switching must be enabled using the x25 routingglobal configuration command. The PVC interface must be a serial interface configured with X.25encapsulation. (The SVC interface may use X.25, XOT, or CMNS.)To configure X.25 switching between PVCs and SVCs, use the following command in interfaceconfiguration mode. X.25 switching must already be configured on the interace.CommandRouter(config-if)# x25 pvc number1 svc x121-address[flow-control-options] [call-control-options]PurposeConfigures PVC traffic to be forwarded to an SVC.To display information about the switched PVC to SVC circuit, use the following command in EXECmode:CommandRouter(config)# show x25 vc [lcn]PurposeDisplays information about the active SVCs and PVCs.For an example of configuring switching between a PVC and SVC, see the section “X.25 SwitchingBetween PVCs and SVCs Example” later in this chapter.Configuring Additional X.25 Routing FeaturesTo configure additional X.25 routing features, perform the tasks in the following sections:• Configuring X.25 Load Balancing• Configuring XOT to Use Interface Default Flow Control Values• Configuring Calling Address Interface-Based Insertion and Removal• Substituting Addresses in an X.25 Route• Configuring XOT Alternate Destinations34