![]() ![]() ![]() User defined classes within a class-based Weighted Fair queue derive their respective weights as a function of the bandwidth command configured in the class as a proportion of the SUM of all bandwidth classes in the Class Based Queue. The formula to derive the weight for a Flow Based Fair Queue is: 32384 / (IP Prec + 1) In order to understand the Class-Based Weighted Fair Queueing (CBWFQ) scheduling algorithm, you must first understand the concept of a weight, which is flow-specific for Flow Based Fair Queues and Class specific for individual Class Based Queues within the Class Based Weighted Fair Queue. ![]() In pre-HQF Cisco IOS images, any class with a bandwidth command can generally be prioritized against classes without bandwidth or priority based on the classes’ Weight. Class-Based Weighted Fair Queueing Primer This document applies to Cisco IOS® Software platforms only, which generally includes Cisco 7200VXR and Cisco ISR 3800, 2800, 1800 series routers, and legacy Cisco Access Routers which includes 3700, 3600, 2600, and 1700 series routers. Refer to Cisco Technical Tips Conventions for more information on document conventions. If your network is live, ensure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. The information in this document is based on these software versions:įor Pre-HQF: Cisco routers that run Cisco IOS Software Release 12.3(26)įor HQF: Cisco routers that run Cisco IOS Software Release 12.4(22)T QoS-Hierarchical Queueing Framework (HQF) Prerequisites RequirementsĬisco recommends that you have knowledge of these topics:Ĭisco IOS® Quality of Service Solutions Configuration Guide This document describes Queue Limits and Output Drops on Cisco IOS® Software platforms and legacy Access Routers. ![]()
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