R211x-HP Flexfabric 11900 ACL and QoS Configuration Guide

WFQ queuing

Figure 16 WFQ queuing

WFQ is similar to WRR. The difference is that WFQ enables you to set guaranteed bandwidth that a

WFQ queue can get during congestion.

SP+WRR queuing

You can implement SP+WRR queuing by assigning some queues to the SP group and others to WRR

groups. On SF cards, SP+WRR queuing schedules queues in the following order:

1. Schedules the queues in the SP group based on their priorities.

2. Schedules queues in WRR groups (group 1 and group 2) when all queues in the SP group are

empty. The queues in a WRR group are scheduled based on their weights. The two WRR groups

are scheduled in the ratio of 1:1.

SP+WFQ queuing

You can implement SP+WFQ queuing by assigning some queues to the SP group and others to WFQ

groups. On SF cards, SP+WFQ queuing schedules traffic in the following order:

1. Schedules the queues in the SP group based on their priorities.

2. Schedules the traffic conforming to the minimum guaranteed bandwidth of each queue in WFQ

groups. The two WFQ groups are scheduled at the ratio of 1:1.

3. Schedules the traffic in each queue of WFQ groups according to the configured weights. The two

WFQ groups are scheduled at the ratio of 1:1.

Congestion management configuration task list

To configure hardware congestion management, you can use one of the following methods:

• Configure queue scheduling for each queue in interface view.

Queue 0 Weight 1

……

Queue 1 Weight 2

Queue N-2Weight N-1

Queue N-1 Weight N

Packets to be sent through

this port

Sent packets

Interface

Queue

scheduling

Sending queue

Packet

classification