Enterprise QoS Solution Reference Network Design Guide

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Catalyst 6500 PFC2/PFC3—QoS Considerations and Design Configuration 2-108 Figure 2-27 Catalyst 6500 1P2Q1T Queuing Model (CatOS Supports 1P2Q2T) Application Voice Interactive-Video Streaming-Video Call-Signaling Transactional Data Network-Management Bulk Data Enterprise QoS Solution Reference Network Design Guide Chapter 2 Campus QoS Design The Catalyst 6500 CatOS configurations to configure 1P2Q1T queuing recommendations are shown below. Example 2-69 Catalyst 6500 CatOS—1P2Q1T Queuing Example (technically 1P2Q2T) CAT6500-PFC2-CATOS> (enable) set qos txq-ratio 1p2q1t 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 1p2q1t 30 70 ! Sets the WRR weights for 30:70 (Q1:Q2) bandwidth servicing CAT6500-PFC2-CATOS> (enable) CAT6500-PFC2-CATOS> (enable) set qos wred 1p2q1t tx queue 1 40:80 ! Sets Q1 WRED Threshold to 40:80 to limit Scavenger/Bulk from dominating Q1 CAT6500-PFC2-CATOS> (enable) set qos wred 1p2q1t tx queue 2 70:80 ! Sets Q2 WRED Threshold to 70:80 to force room for Network Control traffic CAT6500-PFC2-CATOS> (enable) CAT6500-PFC2-CATOS> (enable) set qos map 1p2q1t tx 1 1 cos 1 ! Assigns Scavenger/Bulk to Q1 WRED Threshold CAT6500-PFC2-CATOS> (enable) set qos map 1p2q1t tx 1 cos 0 ! Assigns Best Effort to Q1 tail (100%) threshold CAT6500-PFC2-CATOS> (enable) set qos map 1p2q1t tx 2 1 cos 2,3,4 ! Assigns CoS 2,3,4 to Q2 WRED Threshold CAT6500-PFC2-CATOS> (enable) set qos map 1p2q1t tx 2 cos 6,7 ! Assigns Network/Internetwork Control to Q2 tail (100%) threshold CAT6500-PFC2-CATOS> (enable) set qos map 1p2q1t tx 3 cos 5 ! Assigns VoIP to PQ (Q3) CAT6500-PFC2-CATOS> (enable) Catalyst 6500 CatOS QoS Verification Commands: show qos info config 1p2q1t 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 1P2Q1T Q4 Q3 (5%) Priority Queue Queue 2 (40%) Queue 1 (30%) Q2T2 Q2T1 Q1T2 Q1T1 Version 3.3
Chapter 2 Campus QoS Design Version 3.3 Catalyst 6500 PFC2/PFC3—QoS Considerations and Design Note The Catalyst 6500 CatOS show qos info verification commands are reasonably similar for each queuing structure and as such (to minimize redundancy) are not detailed for each queuing model example. In IOS, for any 1PxQyT queuing structure, setting the size of the priority queue is not supported. The only exception to this is within the 1P2Q2T structure, where the priority queue (Q3) is indirectly set to equal Q2’s size. Therefore, in all examples of Catalyst 6500 IOS queuing structure configurations to follow (that support a PQ) only the sizes of the standard queues are being set. Furthermore, specific to the 1P2Q1T queuing structure, CoS values cannot be mapped to the tail of the queue, as in CatOS. CoS values can be mapped only to the single WRED threshold for each queue. Therefore, the 1P2Q1T queuing and dropping recommendation requires some slight alterations for Cisco IOS. These include changing Q1T1’s WRED threshold to 80:100 and, likewise, changing Q2T1’s WRED threshold to 80:100. The syntax-logic for setting WRED thresholds in IOS is different from CatOS. In CatOS, minimum and maximum WRED thresholds were set on the same line; in IOS, minimum and maximum WRED thresholds are set on different lines. After these WRED thresholds have been altered, then CoS 1 (Scavenger/Bulk) and CoS 0 (Best Effort) can be assigned to Q1T1; CoS 2 (Network Management and Transactional Data), CoS 3 (call signaling and Mission-Critical Data), CoS 4 (Interactive and Streaming Video) and CoS 6 and 7 (Internetwork and Network Control) can be assigned to Q2T1; CoS 5 (VoIP) can be assigned to Q3 (the PQ). The Catalyst 6500 IOS configurations to configure 1P2Q1T queuing recommendations are shown below. Example 2-70 Catalyst 6500 IOS—1P2Q1T Queuing Example CAT6500-PFC3-IOS(config)#interface TenGigabitEthernet1/1 CAT6500-PFC3-IOS(config-if)# wrr-queue queue-limit 30 40 ! Sets the buffer allocations to 30% for Q1 and 40% for Q2 CAT6500-PFC3-IOS(config-if)# wrr-queue bandwidth 30 70 ! Sets the WRR weights for 30:70 (Q1:Q2) bandwidth servicing CAT6500-PFC3-IOS(config-if)# CAT6500-PFC3-IOS(config-if)# wrr-queue random-detect min-threshold 1 80 ! Sets Min WRED Threshold for Q1T1 to 80% CAT6500-PFC3-IOS(config-if)# wrr-queue random-detect max-threshold 1 100 ! Sets Max WRED Threshold for Q1T1 to 100% CAT6500-PFC3-IOS(config-if)# wrr-queue random-detect min-threshold 2 80 ! Sets Min WRED Threshold for Q2T1 to 80% CAT6500-PFC3-IOS(config-if)# wrr-queue random-detect max-threshold 2 100 ! Sets Max WRED Threshold for Q2T1 to 100% CAT6500-PFC3-IOS(config-if)# CAT6500-PFC3-IOS(config-if)# wrr-queue cos-map 1 1 1 0 ! Assigns Scavenger/Bulk and Best Effort to Q1 WRED Threshold 1 CAT6500-PFC3-IOS(config-if)# wrr-queue cos-map 2 1 2 3 4 6 7 ! Assigns CoS 2,3,4,6 and 7 to Q2 WRED Threshold 1 CAT6500-PFC3-IOS(config-if)# priority-queue cos-map 1 5 ! Assigns VoIP to PQ (Q3) CAT6500-PFC3-IOS(config-if)#end CAT6500-PFC3-IOS(config-if)# Catalyst 6500 MLS QoS Verification Commands: show queueing interface Catalyst 6500—1P2Q2T Queuing and Dropping This section includes the following topics: Enterprise QoS Solution Reference Network Design Guide 2-109
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QoS Overview What is QoS? Version 3
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Enterprise QoS Solution Reference Network Design Guide

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