There are 8 (eight) FCs supported on 7210 SAS devices. Each FC is mapped to a specific queue. By mapping FCs to different queues the differential treatment is imparted to various classes of traffic.
On the 7210 SAS devices, there are only 8 (eight) queues available at the port level for all ports. These 8 (eight) queues are created by default per port. Users cannot create or delete the queues nor the queue ID. Only the queue parameters can be changed. The queue ID is not configurable, and queue IDs 1 to 8 are, by default, used to identify the 8 (eight) queues available on the port. Queue parameters for the 8 (eight) queues can be configured using the different QoS policies based on the capabilities available on different 7210 SAS platforms. See QoS policies for more information.
The queue IDs 1 to 8 are assigned to each of the 8 (eight) queues. Queue-ID 8 is the highest priority and queue-id 1is the lowest priority. FCs are correspondingly mapped to these queue IDs according to their priority. The following table describes the system-defined map.
| FC-ID | FC name | FC designation | Unicast queue-ID |
|---|---|---|---|
7 |
Network control |
NC |
8 |
6 |
High-1 |
H1 |
7 |
5 |
Expedited |
EF |
6 |
4 |
High-2 |
H2 |
5 |
3 |
Low-1 |
L1 |
4 |
2 |
Assured |
AF |
3 |
1 |
Low-2 |
L2 |
2 |
0 |
Best-Effort |
BE |
1 |