Command Line Interface Guide

902 Data Center Bridging Commands
It is recommended that all strict priority traffic classes be mapped to a single
TCG.
Internally, frames are selected for transmission from the strict priority TCGs
first, then, once the constraints of the TCGs are satisfied, frames from the
WRR TCGs are selected for transmission. For example, grouping strict
priority assignments into TCG 1 and weighted assignments into TCG 0 will
result in all frames of the highest priority in TCG 1 being transmitted first,
then the next lower priority, et. seq. until no frames remain for transmission
in TCG 1. Then the scheduler will process frames from TCG 0, giving them
appropriate treatment based upon the weights, minimum bandwidth and
maximum bandwidth constraints.
Traffic class group 7 is reserved by the system for internal use.
Example
The following example demonstrates how to globally map priorities 1 and 2 to
TCG 1.
console(config)# classofservice traffic-class-group 1 1
console(config)# classofservice traffic-class-group 2 1
traffic-class-group max-bandwidth
Use this command in Global Config or Interface Config mode to specify the
maximum transmission bandwidth limit for each TCG as a percentage of the
interface rate. Also known as rate shaping, this has the effect of smoothing
temporary traffic bursts over time so that the transmitted traffic rate is
bound.
Syntax
traffic-class-group max-bandwidth <bw-0> <bw-1> … <bw-n>
no traffic-class-group max-bandwidth
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