WFQ Queue-Servicing Algorithm
You can configure the WFQ service policy. The WFQ policy implemented in the Cajun II Queue Classification and Servicing sub-system is a variation of the textbook WFQ algorithm. In Cajun II WFQ, each queue is assigned a weight increment. The weight increment never varies; however, each queue also maintains an accumulated weight, which is updated after each queue service cycle. Queues are serviced based upon their relative accumulated weights. In each queue service cycle, only the queue with the highest accumulated weight is serviced. If there is a tie, the queue with the highest priority (0 – 7 highest) is serviced first. After each queue service cycle, the accumulated weight for the queue that is serviced is reset to the value of its weight increment, and the accumulated weight for the other queues is increased by their respective weight increments.
When you set a port for WFQ, the switch services priority queues according to their assigned weight. The queue with the highest weight is serviced first.
There are two levels to the WFQ command. The first level specifies the modules/ports to be configured. The second level specifies the queue weights.
Port Mirroring on 80-Series Modules
The port mirroring on 80-series modules that is implemented in v5.2.2 provides the ability for the 80-series modules to monitor traffic that a port transmits and receives. Four channels are provided for monitoring traffic, so you can monitor four different ports or port ranges simultaneously.
*Note: Your switch must be in fabric mode 2 to perform 80-series port mirroring.
You can configure port mirroring on 80-series modules by using either the command-line interface (CLI) or the Web Agent.
6 | June 14, 2001 | 610-0184-095 |