System information

2-65
Class of Service Configuration
2
Setting the Service Weight for Traffic Classes
This switch uses the Weighted Round Robin (WRR) algorithm to determine the
frequency at which it services each priority queue. As described in “Mapping CoS
Values to Egress Queues” on page 2-63, the traffic classes are mapped to one of the
four egress queues provided for each port. You can assign a weight to each of these
queues (and thereby to the corresponding traffic priorities). This weight sets the
frequency at which each queue will be polled for service, and subsequently affects
the response time for software applications assigned a specific priority value.
Command Attributes
• WRR Setting Table* – Displays a list of weights for each traffic class (i.e., queue).
• Weight Value – Set a new weight for the selected traffic class. (Range: 1-255)
* CLI shows Queue ID.
Web – Click Priority, Queue Scheduling. Select a traffic class (i.e., output queue),
enter a weight, then click Apply.
Figure 2-43. Configuring Interfaces for Queue Scheduling
CLI – The following example shows how to assign WRR weights of 1, 4, 16 and 64
to the CoS priority queues 0, 1, 2 and 3.
Console(config)#queue bandwidth 1 4 16 64 3-112
Console(config)#exit
Console#show queue bandwidth 3-114
Queue ID Weight
-------- ------
0 1
1 4
2 16
3 64
Console#