The ExtremeXOS software allows you to specify the CIR and PR in gigabits per second (Gbps), megabits per second (Mbps), or kilobits per second (Kbps). Most commands also allow you to specify the CIR and PR as a percentage of the maximum port bandwidth using the minbw (CIR) and maxbw (PR) options. The default value on all minimum bandwidth parameters is 0%, and the default value on all maximum bandwidth parameters is 100%.
QoS can be applied at different locations in the traffic path using the following rate-limiting and rate-shaping components:
The CIR or minimum bandwidth configuration for a rate-limiting or rate-shaping component is a bandwidth guarantee for that component at a particular location in the traffic path. The guarantees for all components at a specified location should add up to less than 100% and should account for the traffic needs of the other components. For example, if you configure 25% minimum bandwidth for four out of eight queues at a particular location, there will be no available bandwidth for the remaining four queues when traffic exceeds the port capacity. Bandwidth unused by a queue can be used by other queues.
The rate-shaping configuration is configured at the location to which it applies on most platforms.