Excess Bandwidth Calculations Terminology

The following definitions are used in this discussion of IQE PIC queue calculations:

CIR mode—A physical interface is in CIR mode when one of more of its “children” (logical interfaces in this case) have a guaranteed rate configured, but some logical interfaces have a shaping rate configured.
Default mode—A physical interface is in default mode if none of its “children” (logical interfaces in this case) have a guaranteed rate or shaping rate configured.
Excess mode—A physical interface is in excess mode when one of more of its “children” (logical interfaces in this case) have an excess rate configured.
PIR mode—A physical interface is in PIR mode if none of its “children” (logical interfaces in this case) have a guaranteed rate configured, but some logical interfaces have a shaping rate configured.