Enterprise QoS Solution Reference Network Design Guide

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Catalyst 6500 PFC2/PFC3—QoS Considerations and Design 2-100 Enterprise QoS Solution Reference Network Design Guide Chapter 2 Campus QoS Design 1P2Q2T—Indicates one strict-priority queue and two standard queues, each with two configurable WRED-drop thresholds. 1P3Q1T—Indicates one strict-priority queue and three standard queues, each with one configurable WRED-drop threshold (however, each standard queue also has one nonconfigurable tail-drop threshold). 1P3Q8T—Indicates one strict-priority queue and three standard queues, each with eight configurable WRED-drop thresholds (however, each standard queue also has one nonconfigurable tail-drop threshold). 1P7Q8T—Indicates one strict-priority queue and seven standard queues, each with eight configurable WRED-drop thresholds (on 1p7q8t ports, each standard queue also has one nonconfigurable tail-drop threshold). Almost all Catalyst 6500 linecards support a strict-priority queue and when supported, the switch services traffic in the strict-priority transmit queue before servicing the standard queues. When the switch is servicing a standard queue, after transmitting a packet, it checks for traffic in the strict-priority queue. If the switch detects traffic in the strict-priority queue, it suspends its service of the standard queue and completes service of all traffic in the strict-priority queue before returning to the standard queue. Additionally, Catalyst 6500 linecards implement CoS-value-based transmit-queue drop thresholds to avoid congestion in transmitted traffic. WRED thresholds can also be defined on certain linecards, where the CoS value of the packet (not the IP Precedence value, although they likely match) determines the WRED weight. WRED parameters include a lower and upper threshold: the low WRED threshold is the queue level where (assigned) traffic begins to be selectively-dropped and the high WRED threshold is the queue level above which all (assigned) traffic is dropped. Furthermore, packets in the queue between the low and high WRED thresholds have an increasing chance of being dropped as the queue fills. The Transmit Queuing/Dropping capabilities can be returned by using the following commands. CatOS: – show port capabilities – show port qos – show qos info IOS: – show queueing interface Table 2-5 shows the Catalyst 6500 linecards that are currently available and their respective queuing/dropping structures. Table 2-5 Catalyst 6500 Linecard Queuing Structures C2 (xCEF720) Modules Description WS-X6704-10GE Catalyst 6500 4-port 10 GigabitEthernet Module WS-X6724-SFP Catalyst 6500 24-port GigabitEthernet SFP Module Receive Queue Structure 1Q8T (8Q8T with DFC3a) 1Q8T; (2Q8T with DFC3a) Transmit Queue Structure Buffer Size 1P7Q8T 16MB per port 1P3Q8T 1MB per port Version 3.3
Chapter 2 Campus QoS Design WS-X6748-GE-TX Catalyst 6500 48-port 10/100/1000 RJ-45 Module WS-X6748-SFP Catalyst 6500 48-port GigabitEthernet SFP Module Classic/CEF256 Ethernet Modules Description WS-X6024-10FL-MT Catalyst 6000 24-port 10BaseFL MT-RJ Module WS-X6148-RJ21 Catalyst 6500 48-Port 10/100 RJ-21 Module (Upgradable to Voice) WS-X6148-RJ21V Catalyst 6500 48-port 10/100 Inline Power RJ-21 Module WS-X6148-RJ45 Catalyst 6500 48-Port 10/100; RJ-45 Module (Upgradable to Voice) WS-X6148-RJ45V Catalyst 6500 48-port 10/100 Inline Power RJ-45 Module WS-X6148-GE-TX Catalyst 6500 48-port 10/100/1000 RJ-45 Module WS-X6148V-GE-TX Catalyst 6500 48-port 10/100/1000 Inline Power RJ-45 Module WS-X6316-GE-TX Catalyst 6000 16-port 1000TX GigabitEthernet RJ-45 Module WS-X6324-100FX-MM Catalyst 6000 24-port 100FX MT-RJ MMF Module (with Enhanced QoS) WS-X6324-100FX-SM Catalyst 6000 24-port 100FX MT-RJ SMF Module (with Enhanced QoS) WS-X6348-RJ-21 Catalyst 6000 48-port 10/100 RJ-21 Module WS-X6348-RJ21V Catalyst 6000 48-port 10/100 Inline Power RJ-21 Module WS-X6348-RJ-45 Catalyst 6500 48-port 10/100 RJ-45 Module (Upgradable to Voice) WS-X6348-RJ45V Catalyst 6500 48-port 10/100 Inline Power RJ-45 Module WS-X6408A-GBIC Catalyst 6000 8-port GigabitEthernet Module (with Enhanced QoS; Requires GBICs) Version 3.3 Catalyst 6500 PFC2/PFC3—QoS Considerations and Design 1Q8T; (2Q8T with DFC3a) 1Q8T; (2Q8T with DFC3a) Receive Queue Structure 1P3Q8T 1MB per port 1P3Q8T 1MB per port Transmit Queue Structure Buffer Size 1Q4T 2Q2T 64KB per port 1Q4T 2Q2T 128KB per port 1Q4T 2Q2T 128KB per port 1Q4T 2Q2T 128KB per port 1Q4T 2Q2T 128KB per port 1Q2T 1P2Q2T 1MB per 8 ports 1Q2T 1P2Q2T 1MB per 8 ports 1P1Q4T 1P2Q2T 512KB per port 1Q4T 2Q2T 128KB per port 1Q4T 2Q2T 128KB per port 1Q4T 2Q2T 128KB per port 1Q4T 2Q2T 128KB per port 1Q4T 2Q2T 128KB per port 1Q4T 2Q2T 128KB per port 1P1Q4T 1P2Q2T 512KB per port WS-X6416-GBIC Catalyst 6000 16-port GigabitEthernet Module (Requires GBICs) 1P1Q4T 1P2Q2T 512KB per port WS-X6416-GE-MT Catalyst 6000 16-port GigabitEthernet MT-RJ Module 1P1Q4T 1P2Q2T 512KB per port WS-X6501-10GEX4 1-port 10 GigabitEthernet Module 1P1Q8T 1P2Q1T 64MB per port Enterprise QoS Solution Reference Network Design Guide 2-101
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