Enterprise QoS Solution Reference Network Design Guide

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Catalyst 6500 PFC2/PFC3—QoS Considerations and Design 2-112 Enterprise QoS Solution Reference Network Design Guide Chapter 2 Campus QoS Design CAT6500-PFC3(config-if-range)# wrr-queue random-detect min-threshold 2 70 80 ! Sets Min WRED Thresholds for Q2T1 and Q2T2 to 70 and 80, respectively CAT6500-PFC3(config-if-range)# wrr-queue random-detect max-threshold 2 80 100 ! Sets Max WRED Thresholds for Q2T1 and Q2T2 to 80 and 100, respectively CAT6500-PFC3(config-if-range)# CAT6500-PFC3(config-if-range)# wrr-queue cos-map 1 1 1 ! Assigns Scavenger/Bulk to Q1 WRED Threshold 1 CAT6500-PFC3(config-if-range)# wrr-queue cos-map 1 2 0 ! Assigns Best Effort to Q1 WRED Threshold 2 CAT6500-PFC3(config-if-range)# wrr-queue cos-map 2 1 2 3 4 ! Assigns CoS 2,3,4 to Q2 WRED Threshold 1 CAT6500-PFC3(config-if-range)# wrr-queue cos-map 2 2 6 7 ! Assigns Network/Internetwork Control to Q2 WRED Threshold 2 CAT6500-PFC3(config-if-range)# CAT6500-PFC3(config-if-range)# priority-queue cos-map 1 5 ! Assigns VoIP to PQ CAT6500-PFC3(config-if-range)#end CAT6500-PFC3-IOS# Catalyst 6500 MLS QoS Verification Commands: show queueing interface Catalyst 6500—1P3Q1T Queuing and Dropping Recommendations This section includes the following topics: Recommendations Configuration Catalyst MLS QoS Verification Commands The 1P3Q1T queuing structure is identical to the 1P2Q1T structure, except that an additional standard queue has been added to it and it does not support tuning the Transmit Size Ratios. Under this model, Q4 is the strict-priority queue. The WRR weights for the standard queues (Q1, Q2, Q3), for dividing the remaining bandwidth, after the priority queue has been fully serviced, can be set to 5:25:70 respectively for Q1:Q2:Q3. In CatOS, within the 1P3T1T queuing structure each CoS value can be assigned to queue and a WRED threshold or just to a queue. When assigned to a queue (only), then the CoS value is limited only by the tail of the queue (in other words, it is assigned to the queue with a tail-drop threshold of 100%). Thus, the tunable WRED threshold for Q1 can be set to 80:100 to provide congestion avoidance for Scavenger/Bulk Data traffic. The WRED threshold for Q2 similarly can be set to 80:100 to provide congestion avoidance on all Best-Effort flows. The WRED threshold for Q3 can be set to 70:80, to provide congestion avoidance for all applications assigned to it and to ensure that there will always be room in the Q3 to service Network and Internetwork Control traffic. Therefore, once the queues and thresholds have been defined as above, then CoS 1 (Scavenger/Bulk) can be assigned to Q1T1; CoS 0 (Best Effort) to Q2T1; CoS 2 (Network Management and Transactional Data), CoS 3 (call signaling and Mission-Critical Data) and CoS 4 (Interactive and Streaming Video) can be assigned to Q3T1; CoS 6 and 7 (Internetwork and Network Control) can be assigned to Q3 (tail); CoS 5 (VoIP) can be assigned to Q4 (the PQ). These 1P3Q1T queuing recommendations are illustrated in Figure 2-29. Version 3.3
Chapter 2 Campus QoS Design Configuration Version 3.3 Catalyst 6500 PFC2/PFC3—QoS Considerations and Design Figure 2-29 Catalyst 6500 1P3Q1T Queuing Model (CatOS supports 1P3Q2T) Application Voice Interactive-Video Streaming-Video Call-Signaling Transactional Data Network-Management Bulk Data The Catalyst 6500 CatOS configurations to configure 1P3Q1T queuing recommendations are shown below. Example 2-73 Catalyst 6500 CatOS—1P3Q1T Queuing Example (technically 1P3Q2T) CAT6500-PFC2-CATOS> (enable) set qos wrr 1p3q1t 5 25 70 ! Sets the WRR weights for 5:25:70 (Q1:Q2:Q3) bandwidth servicing CAT6500-PFC2-CATOS> (enable) CAT6500-PFC2-CATOS> (enable) set qos wred 1p3q1t tx queue 1 80:100 ! Sets Q1 WRED T1 to 80:100 to provide congestion-avoidance for Scavenger/Bulk CAT6500-PFC2-CATOS> (enable) set qos wred 1p3q1t tx queue 2 80:100 ! Sets Q2 WRED T1 to 80:100 to provide congestion-avoidance for Best Effort CAT6500-PFC2-CATOS> (enable) set qos wred 1p3q1t tx queue 3 70:80 ! Sets Q3 WRED T1 to 70:80 to provide congestion-avoidance for CoS 2,3,4 ! and to force room (via tail-drop) for Network Control traffic CAT6500-PFC2-CATOS> (enable) CAT6500-PFC2-CATOS> (enable) set qos map 1p3q1t tx 1 1 cos 1 ! Assigns Scavenger/Bulk to Q1 WRED Threshold 1 (80:100) CAT6500-PFC2-CATOS> (enable) set qos map 1p3q1t tx 2 1 cos 0 ! Assigns Best Effort to Q2 WRED Threshold 1 (80:100) CAT6500-PFC2-CATOS> (enable) set qos map 1p3q1t tx 3 1 cos 2,3,4 ! Assigns CoS 2,3,4 to Q3 WRED Threshold 1 (70:80) CAT6500-PFC2-CATOS> (enable) set qos map 1p3q1t tx 3 cos 6,7 ! Assigns Network/Internetwork Control to Q3 Tail (100%) CAT6500-PFC2-CATOS> (enable) set qos map 1p3q1t tx 4 cos 5 ! Assigns VoIP to PQ (Q4) CAT6500-PFC2-CATOS> (enable) Catalyst 6500 CatOS QoS Verification Commands: show qos info config 1p3q1t tx show qos info runtime show qos statistics DSCP Network Control - Internetwork Control CS6 EF AF41 CS4 Mission-Critical Data DSCP 25 AF31/CS3 AF21 CS2 AF11 Scavenger CS1 Best-Effort 0 CoS CoS 7 CoS 6 CoS 5 CoS 4 CoS 4 CoS 3 CoS 3 CoS 2 CoS 2 CoS 1 CoS 1 0 CoS 5 CoS 7 CoS 6 CoS 4 CoS 3 CoS 2 CoS 0 CoS 1 1P3Q1T Q4 Q4(5%) Priority Queue Queue 3 (70%) Queue 2 (25%) Queue 1 (5%) Q3T2 Q3T1 Enterprise QoS Solution Reference Network Design Guide 2-113
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