Administrator Guide

Contents 47
44 Class-of-Service . . . . . . . . . . . . . . . . . 1473
CoS Overview . . . . . . . . . . . . . . . . . . . . . 1473
What Are Trusted and Untrusted Port
Modes?
. . . . . . . . . . . . . . . . . . . . . . 1474
How Is Traffic Shaping Used on
Egress Traffic? . . . . . . . . . . . . . . . . . . 1474
How Are Traffic Queues Defined?
. . . . . . . . 1475
Which Queue Management Methods
Are Supported?
. . . . . . . . . . . . . . . . . . 1475
CoS Queue Usage
. . . . . . . . . . . . . . . . 1476
Default CoS Values
. . . . . . . . . . . . . . . . . . 1477
Configuring CoS (Web)
. . . . . . . . . . . . . . . . 1478
Mapping Table Configuration
. . . . . . . . . . 1478
Interface Configuration
. . . . . . . . . . . . . . 1480
Interface Queue Configuration
. . . . . . . . . . 1481
Interface Queue Drop Precedence
Configuration
. . . . . . . . . . . . . . . . . . . 1482
Configuring CoS (CLI) . . . . . . . . . . . . . . . . . 1484
Mapping Table Configuration
. . . . . . . . . . 1484
CoS Interface Configuration Commands . . . . . 1485
Interface Queue Configuration
. . . . . . . . . . 1485
Configuring Interface Queue Drop
Probability . . . . . . . . . . . . . . . . . . . . 1487
CoS Configuration Example . . . . . . . . . . . . . . 1488
WRED
. . . . . . . . . . . . . . . . . . . . . . . . . . 1491
WRED Processing
. . . . . . . . . . . . . . . . 1491
WRED Drop Probabilities
. . . . . . . . . . . . . 1491
Exponential Weighting Constant . . . . . . . . . 1492
WRED Color-Aware Processing . . . . . . . . . 1492
Simple Meter Implementation . . . . . . . . . . 1493
Single Rate Meter Implementation
. . . . . . . . 1493