Enterprise QoS Solution Reference Network Design Guide

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Catalyst 6500 PFC2/PFC3—QoS Considerations and Design Recommendations 2-110 Recommendations Configuration Catalyst MLS QoS Verification Commands Enterprise QoS Solution Reference Network Design Guide Chapter 2 Campus QoS Design The 1P2Q2T queuing model is essentially identical to the 1P2Q1T model, except that it supports two configurable WRED thresholds per queue. Under this model, CoS values cannot be mapped to the tail of the queue, as with the 1P2Q1T model, and so there are (as the name correctly implies this time) two effective thresholds per queue. Under a 1P2Q2T model, buffer space can be allocated as follows: 30% for Q1 (the Scavenger/Bulk with Best Effort queue), 40% for Q2 (the preferential queue), and 30% for the Q3 (the priority queue). The WRR weights for Q1 and Q2 (for dividing the remaining bandwidth, after the priority queue has been fully serviced) remain at 30:70 respectively for Q1:Q2. Under the 1P2Q2T model, each WRED threshold is defined with a lower and upper limit. Therefore, the first WRED threshold for Q1 can be set to 40:80, so that Scavenger/Bulk Data traffic can be WRED-dropped if Q1 hits 40 percent and can be tail-dropped if Q1 exceeds 80 percent of its capacity (this prevents Scavenger/Bulk Data from drowning out Best-Effort traffic in Q1). The second WRED threshold for Q1 can be set to 80:100 to provide congestion avoidance for Best-Effort traffic. Similarly, the first WRED threshold of Q2 can be set to 70:80, and the second can be set to 80:100. In this manner, congestion avoidance will be provided for all traffic types in Q2, and there will always be room in the queue to service Network and Internetwork Control traffic. Therefore, once the queues have been defined as above, then CoS 1 (Scavenger/Bulk) can be assigned to Q1T1; CoS 0 (Best Effort) to Q1T2; 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 Q2T1; CoS 6 and 7 (Internetwork and Network Control) can be assigned to Q2T2; CoS 5 (VoIP) can be assigned to Q3T1 (the PQ). These 1P2Q2T queuing recommendations are illustrated in Figure 2-28. Figure 2-28 Catalyst 6500 1P2Q2T Queuing Model Application Voice Interactive-Video Streaming-Video Call-Signaling Transactional Data Network-Management Bulk Data 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 1P2Q2T Q3 (30%) Q4 (5%) Priority Queue Queue 2 (30%) Queue 1 (40%) Q2T2 Q2T1 Q2T1 Q1T1 Version 3.3
Chapter 2 Campus QoS Design Configuration Version 3.3 Catalyst 6500 PFC2/PFC3—QoS Considerations and Design The Catalyst 6500 CatOS configurations to configure 1P2Q1T queuing recommendations are shown below. Example 2-71 Catalyst 6500 CatOS—1P2Q2T Queuing Example CAT6500-PFC2-CATOS> (enable) set qos txq-ratio 1p2q2t 30 40 30 ! Sets the buffer allocations to 30% for Q1, 40% for Q2, 30% for Q3 (PQ) CAT6500-PFC2-CATOS> (enable) set qos wrr 1p2q2t 30 70 ! Sets the WRR weights for 30:70 (Q1:Q2) bandwidth servicing CAT6500-PFC2-CATOS> (enable) CAT6500-PFC2-CATOS> (enable) set qos wred 1p2q2t tx queue 1 40:80 80:100 ! Sets Q1 WRED T1 to 40:80 to limit Scavenger/Bulk from dominating Q1 ! Sets Q1 WRED T2 to 80:100 to provide congestion-avoidance for Best Effort CAT6500-PFC2-CATOS> (enable) set qos wred 1p2q2t tx queue 2 70:80 80:100 ! Sets Q2 WRED T1 to 70:80 to provide congestion-avoidance ! Sets Q2 WRED T2 to 80:100 to force room for Network Control traffic CAT6500-PFC2-CATOS> (enable) CAT6500-PFC2-CATOS> (enable) set qos map 1p2q2t tx 1 1 cos 1 ! Assigns Scavenger/Bulk to Q1 WRED Threshold 1 CAT6500-PFC2-CATOS> (enable) set qos map 1p2q2t tx 1 2 cos 0 ! Assigns Best Effort to Q1 WRED Threshold 2 CAT6500-PFC2-CATOS> (enable) set qos map 1p2q2t tx 2 1 cos 2,3,4 ! Assigns CoS 2,3,4 to Q2 WRED Threshold 1 CAT6500-PFC2-CATOS> (enable) set qos map 1p2q2t tx 2 2 cos 6,7 ! Assigns Network/Internetwork Control to Q2 WRED Threshold 2 CAT6500-PFC2-CATOS> (enable) set qos map 1p2q2t tx 3 1 cos 5 ! Assigns VoIP to PQ CAT6500-PFC2-CATOS> (enable) Catalyst 6500 CatOS QoS Verification Commands: show qos info config 1p2q2t tx show qos info runtime show qos statistics The compatible Catalyst 6500 IOS configurations to configure 1P2Q1T queuing recommendations are shown below. Notice that the buffer allocation for the PQ (Q3) is not configurable, but is, by default (for the 1P2Q2T queuing structure only) set to equal the size defined for Q2. Therefore, the queue size ratios have been slightly altered from the CatOS version of this queuing model to take this default IOS behavior into account; specifically Q1 is set to 40% and Q2 is set to 30% (which indirectly sets Q3 to match, at 30%). The Catalyst 6500 IOS configurations to configure 1P2Q2T queuing recommendations are shown below. Example 2-72 Catalyst 6500 IOS—1P2Q2T Queuing CAT6500-PFC3-IOS(config)#interface range GigabitEthernet4/1 - 8 CAT6500-PFC3(config-if-range)# wrr-queue queue-limit 40 30 ! Sets the buffer allocations to 40% for Q1 and 30% for Q2 ! Indirectly sets PQ (Q3) size to equal Q2 (which is set to 30%) CAT6500-PFC3(config-if-range)# wrr-queue bandwidth 30 70 ! Sets the WRR weights for 30:70 (Q1:Q2) bandwidth servicing CAT6500-PFC3(config-if-range)# CAT6500-PFC3(config-if-range)# wrr-queue random-detect min-threshold 1 40 80 ! Sets Min WRED Thresholds for Q1T1 and Q1T2 to 40 and 80, respectively CAT6500-PFC3(config-if-range)# wrr-queue random-detect max-threshold 1 80 100 ! Sets Max WRED Thresholds for Q1T1 and Q1T2 to 80 and 100, respectively CAT6500-PFC3(config-if-range)# Enterprise QoS Solution Reference Network Design Guide 2-111
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