Cisco IOS Wide-Area Networking Configuration Guide - Free Books

Step 3Step 4CommandRouter(config-if)# service-policy outputpolicy-map-nameRouter(config-if)# frame-relay fragmentfragment-size end-to-endPurposeAttaches a policy map to an output interface, to be used as theservice policy for that interface.• If shaping is being used, use this command to attach theshaping policy (which includes the nested queueing policy) tothe interface.• Interleaving of high-priority frames will not work if shapingis configured on the interface.• If shaping is not being used, use this command to attach thequeueing policy to the interface.Enables fragmentation of Frame Relay frames.• To maintain low latency and low jitter for priority queuetraffic, configure the fragment size to be greater than thelargest high-priority frame that would be expected.Verifying Frame Relay Queueing and Fragmentation at the InterfaceTo verify the configuration and performance of Frame Relay queueing and fragmentation at theinterface, perform the following steps:Step 1Enter the show running-config command to verify the configuration.Router# show running-configBuilding configuration......class-map match-all voicematch ip precedence 5!!policy-map llqclass voicepriority 64policy-map shaperclass class-defaultshape peak 96000service-policy llq!!interface Serial1/1ip address 16.0.0.1 255.255.255.0encapsulation frame-relayservice-policy output shaperframe-relay fragment 80 end-to-end!Step 2Enter the show policy-map interface command to display low-latency queueing information, packetcounters, and statistics for the policy map applied to the interface. Compare the values in the “packets”and the “pkts matched” counters; under normal circumstances, the “packets” counter is much larger thanthe “pkts matched” counter. If the values of the two counters are nearly equal, then the interface isreceiving a large number of process-switched packets or is heavily congested.8