The arbitration of traffic from 4-priority and 16-priority schedulers towards an access egress port is achieved by configuring a committed aggregate rate limit for the aggregate of all the 4-priority unshaped SAPs. By configuring the 4-priority unshaped SAPs committed aggregate rate, the arbitration between the 16-priority shaped SAPs, 16-priority unshaped SAPs, and 4-priority unshaped SAPs is handled in the following priority order:
committed traffic: 16-priority per-SAP agg-rate-limit committed for shaped SAPs and 4-priority aggregate committed rate for all the unshaped SAPs
uncommitted traffic: 16-priority per-SAP agg-rate-limit uncommitted for shaped and unshaped SAPs and 4-priority aggregate uncommitted rate for all the unshaped SAPs
Figure: Access Egress 16-Priority and 4-Priority per-SAP Arbitration for a Single Port illustrates the traffic treatment for a single Ethernet port. It also illustrates that the shaped SAP aggregate CIR rate competes with the unshaped 4-priority aggregate CIR rate for port bandwidth. Once the aggregate CIR rates are satisfied, the shaped SAP aggregate PIR rate competes with the 4-priority PIR rate (always maximum) for port bandwidth.
The egress aggregate CIR rate limit for all the unshaped 4-priority SAPs is configured using the config>port>ethernet>access>egress>unshaped-sap-cir command.
