To support hierarchical QoS (H-QoS) on second-generation Ethernet adapter cards, the 7705 SAR supports the configuration of one aggregate CIR rate for all the unshaped 4-priority access egress Ethernet SAPs on a port, thereby ensuring that all the unshaped SAPs can compete with the shaped SAPs on the port for fabric bandwidth. Use the config>port>ethernet>access>egress>unshaped-sap-cir command to set the aggregate CIR rate.
Third-generation (Gen-3) Ethernet adapter cards and platforms have 4-priority schedulers, and all SAPs are shaped SAPs. See Table: Ethernet Adapter Card, Module, and Platform Generations for a list of Gen-2 and Gen-3 adapter cards, modules, and platforms. Refer to the ‟QoS for Gen-3 Adapter Cards and Platforms” section in the 7705 SAR Quality of Service Guide for more information on 4-priority schedulers for Gen-3 hardware.
Ports on the 4-port SAR-H Fast Ethernet module do not support H-QoS.
For more information on H-QoS and on shaped and unshaped Ethernet SAPs, refer to the ‟Per-SAP Aggregate Shapers (H-QoS)” section in the 7705 SAR Quality of Service Guide.