Enterprise QoS Solution Reference Network Design Guide

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Customer Edge QoS Design Considerations 5-10 Enterprise QoS Solution Reference Network Design Guide Chapter 5 MPLS VPN QoS Design Under such a model, there is no recommended provision for protecting Streaming-Video (following the “Don’t mix TCP with UDP” guideline), nor is there a service-provider class suitable for bulk data, which consists of large, nonbursty TCP sessions that could drown out smaller data transactions. Figure 5-5 shows a re-marking diagram for a three-class service-provider model. Figure 5-5 Three-Class Provider-Edge Model Re-Marking Diagram Enterprise Application Routing Voice Interactive-Video Streaming-Video Mission-Critical Data Call-Signaling Transactional Data Network-Management Scavenger Best-Effort Example 5-3 shows an example CE configuration for an advanced enterprise model mapping (over a dual-T1 link) into a three-class service-provider model. Example 5-3 CE Configuration for Three-Class Provider-Edge Model ! class-map match-all ROUTING match ip dscp cs6 class-map match-all VOICE match ip dscp ef DSCP CS6 EF AF41 CS5 CS4 DSCP 25 AF31 AF31/CS3 CS5 AF21 CS3 CS2 CS3 Bulk Data AF11 CS1 class-map match-all INTERACTIVE-VIDEO match ip dscp af41 class-map match-all MISSION-CRITICAL-DATA match ip dscp 25 class-map match-any CALL-SIGNALING match ip dscp af31 match ip dscp cs3 class-map match-all TRANSACTIONAL-DATA match ip dscp af21 class-map match-all NETWORK-MANAGEMENT match ip dscp cs2 class-map match-all SCAVENGER match ip dscp cs1 ! ! policy-map CE-THREE-CLASS-SP-MODEL class ROUTING 0 X X EF CS5 CS6 AF31 CS3 PE Classes Real-Time 35% Critical Data 40% Best-Effort 25% Version 3.3
Chapter 5 MPLS VPN QoS Design Version 3.3 Customer Edge QoS Design Considerations bandwidth percent 3 ! Routing is assigned (by default) to Critical SP class class VOICE priority percent 18 ! Voice is admitted to Realtime SP class class INTERACTIVE-VIDEO priority percent 15 set ip dscp cs5 ! Interactive-Video is assigned to the Realtime SP class class CALL-SIGNALING priority percent 2 ! Call-Signaling gets LLQ for this scenario set ip dscp cs5 ! Call-Signaling is assigned to the Realtime SP class class MISSION-CRITICAL-DATA bandwidth percent 20 random-detect set ip dscp af31 ! MC Data is assigned to the Critical SP class class TRANSACTIONAL-DATA bandwidth percent 15 random-detect set ip dscp cs3 ! Transactional Data is assigned to Critical SP class class NETWORK-MANAGEMENT bandwidth percent 2 set ip dscp cs3 ! Net Mgmt is assigned to Critical SP class class SCAVENGER bandwidth percent 1 class class-default bandwidth percent 24 random-detect ! Verification commands: show policy show policy interface The max-reserved-bandwidth command might be required on the interface to which the previously discussed policy is applied. Four-Class Provider-Edge Model: CE Design Building on the previous model, a fourth class is added that can be used for either Bulk Data or Streaming-Video. The admission criterion for this new class is either DSCP AF21 or CS2. The re-marking diagram shown in Figure 5-6 illustrates how this new class can be used for Streaming-Video and (primarily UDP-based) Network-Management traffic. Enterprise QoS Solution Reference Network Design Guide 5-11
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