Defining CoS Traffic Control Profiles (Priority Group Scheduling)
A traffic control profile defines the output bandwidth and scheduling characteristics of forwarding class sets (priority groups). The forwarding classes (which are mapped to output queues) contained in a forwarding class set (fc-set) share the bandwidth resources that you configure in the traffic control profile. A scheduler map associates forwarding classes with schedulers to define how the individual forwarding classes that belong to an fc-set share the bandwidth allocated to that fc-set.
The parameters you configure in a traffic control profile define the following characteristics for the fc-set:
guaranteed-rate—Minimum bandwidth, also known as the committed information rate (CIR). The guaranteed rate also determines the amount of excess (extra) port bandwidth that the fc-set can share. Extra port bandwidth is allocated among the fc-sets on a port in proportion to the guaranteed rate of each fc-set.Note:You cannot configure a guaranteed rate for a, fc-set that includes strict-high priority queues. If the traffic control profile is for an fc-set that contains strict-high priority queues, do not configure a guaranteed rate.
shaping-rate—Maximum bandwidth, also known as the peak information rate (PIR).scheduler-map—Bandwidth and scheduling characteristics for the queues, defined by mapping forwarding classes to schedulers. (The queue scheduling characteristics represent amounts or percentages of the fc-set bandwidth, not the amounts or percentages of total link bandwidth.)
Because a port can have more than one fc-set, when you assign resources to an fc-set, keep in mind that the total port bandwidth must serve all of the queues associated with that port.
To configure a traffic control profile using the CLI: