Cisco IOS Wide-Area Networking Configuration Guide - Free Books

Configuring Additional X.25 Datagram Transport FeaturesConfiguring X.25 and LAPBEstablishing the Packet Acknowledgment PolicyYou can instruct the Cisco IOS software to send an acknowledgment packet when it has received athreshold of data packets it has not acknowledged, instead of waiting until its input window is full. Avalue of 1 sends an acknowledgment for each data packet received if it cannot be acknowledged in anoutgoing data packet. This approach improves line responsiveness at the expense of bandwidth. A valueof 0 restores the default behavior of waiting until the input window is full.To establish the acknowledgment threshold, use the following command in interface configuration mode(the packet acknowledgment threshold also applies to encapsulation PVCs):CommandRouter(config-if)# x25 threshold delay-countPurposeSets data packet acknowledgement threshold.Configuring X.25 User FacilitiesX.25 software provides commands to support X.25 user facilities options (specified by the ITU-TRecommendation X.25) that allow you to use network features such as reverse charging, useridentification, and flow control negotiation. You can choose to configure facilities on a per-map basis oron a per-interface basis. In the following table, the x25 map commands configure facilities on a per-mapbasis; the x25 facility commands specify the values set for all encapsulation calls originated by theinterface. Routed calls are not affected by the facilities specified for the outgoing interface.To set the supported X.25 user facilities options, use one or more of the following commands in interfaceconfiguration mode:CommandRouter(config-if)# x25 facility cug numberPurposeSelects the closed user group (CUG).orx25 map protocol address [protocol2 address2 [...[protocol9address9]]] x121-address cug group-numberRouter(config-if)# x25 facility packetsize in-size out-sizeorRouter(config-if)# x25 map protocol address [protocol2address2 [...[protocol9 address9]]] x121-address packetsizein-size out-sizeSets the flow control parameter negotiation values tobe requested on outgoing calls.orRouter(config-if)# x25 facility windowsize in-size out-sizeorRouter(config-if)# x25 map protocol address [protocol2address2 [...[protocol9 address9]]] x121-address windowsizein-size out-size28