Dell PowerEdge FX2 Dell PowerEdge FN I/O Aggregator Configuration Guide 9.6(0 - Page 56

Hierarchical Scheduling in ETS Output Policies ETS supports up to three levels of hierarchical scheduling. For example, you can apply ETS output policies with the following configurations: Priority group 1 Priority group 2 Priority group 3 Assigns traffic to one priority queue with 20% of the link bandwidth and strictpriority scheduling. Assigns traffic to one priority queue with 30% of the link bandwidth. Assigns traffic to two priority queues with 50% of the link bandwidth and strictpriority scheduling. In this example, the configured ETS bandwidth allocation and scheduler behavior is as follows: Unused bandwidth usage: Normally, if there is no traffic or unused bandwidth for a priority group, the bandwidth allocated to the group is distributed to the other priority groups according to the bandwidth percentage allocated to each group. However, when three priority groups with different bandwidth allocations are used on an interface: • If priority group 3 has free bandwidth, it is distributed as follows: 20% of the free bandwidth to priority group 1 and 30% of the free bandwidth to priority group 2. • If priority group 1 or 2 has free bandwidth, (20 + 30)% of the free bandwidth is distributed to priority group 3. Priority groups 1 and 2 retain whatever free bandwidth remains up to the (20+ 30)%. Strict-priority groups: If two priority groups have strict-priority scheduling, traffic assigned from the priority group with the higher priority-queue number is scheduled first. However, when three priority groups are used and two groups have strict-priority scheduling (such as groups 1 and 3 in the example), the strict priority group whose traffic is mapped to one queue takes precedence over the strict priority group whose traffic is mapped to two queues. Therefore, in this example, scheduling traffic to priority group 1 (mapped to one strict-priority queue) takes precedence over scheduling traffic to priority group 3 (mapped to two strict-priority queues). Troubleshooting PFC, ETS, and DCBx Operation In the show interfaces pfc | ets | dcbx output, the DCBx operational status may be down for any of the reasons described in the following table. When DCBx is down, the following values display in the show output field for DCBx Oper status: • PFC DCBx Oper status: Down • ETS DCBx Oper status: Down • DCBx Oper status: Disabled. Reason Port Shutdown Description Port is shut down. All other reasons for DCBx inoperation, if any, are ignored. 56 Data Center Bridging (DCB)