Brocade Multi-Service IronWare QoS and Traffic Management Configuration Guide (Supporting R05.6.00) - Manual (Page 141)

Multi-Service IronWare QoS and Traffic Management Configuration Guide 127
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Scheduling traffic for forwarding
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• WFQ weight-based traffic scheduling – With WFQ destination-based scheduling enabled, some
weight-based bandwidth is allocated to all queues. With this scheme, the configured weight
distribution is guaranteed across all traffic leaving an egress port and an input port is
guaranteed allocation in relationship to the configured weight distribution.
• Mixed strict priority and weight-based scheduling – This scheme provides a mixture of strict
priority for the three highest priority queues and WFQ for the remaining priority queues.
Configuring traffic scheduling
Traffic scheduling can be configured on a per-port basis. It affects the outgoing traffic on the
configured port when bandwidth congestion occurs on that port. The following sections describe
how to configure each of the traffic scheduling schemes:
• “Configuring strict priority-based traffic scheduling” This option is the default traffic scheduling
method if traffic scheduling is not configured on a port.
• “Calculating the values for WFQ Weight-based traffic scheduling”
• “Configuring WFQ weight-based traffic scheduling”
• “Configuring mixed strict priority and weight-based scheduling”
• “Configuring egress unicast and multicast traffic scheduling,”
Configuring strict priority-based traffic scheduling
To configure strict priority-based scheduling use a command such as the following.
Brocade(config)# interface ethernet 1/1
Brocade(config-if-e1000-1/1)# qos scheduler strict
Syntax: qos scheduler strict
This is the default when traffic scheduling is not configured.
Calculating the values for WFQ Weight-based traffic scheduling
Weighted Fair Queueing (WFQ) scheduling is configured to be a percentage of available bandwidth
using the following formula.
Where
q (x) = The value of the queue that you want to determine the weight for. It can be the value of any
queue (0 - 7).
q0 - q7 = the assigned values of the eight queues.
Weight of q (x) = the calculated weight as a percentage of the port’s total bandwidth.
For example if you assign the following values to queues 0 to 7:
• Queue 0 =10, Queue 1 = 15, Queue 2 = 20, Queue 3 = 25, Queue 4 = 30, Queue 5 = 35,
Queue 6 = 40, and Queue 7 = 45,
q (x)
Weight of q (x) = -----------------------------------------
q0 + q1 + q2 +q3+ q4 + q5 +q6 +q7