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Help breaking down QoS config

Below is my QoS config. I am brand new to this so i was wondering if someone could tell me whats going on or a link to some where it explains it. P3 is that the pesendence bit that i need to set to reach that que? Or if someone can write a word or two on what all this means? I have to compare a few of them.

class-of-service {
    classifiers {
        inet-precedence precedence-classifier {
            forwarding-class network-control {
                loss-priority low code-points 101;
            }
            forwarding-class assured-forwarding {
                loss-priority low code-points [ 100 110 111 ];
            }
            forwarding-class expedited-forwarding {
                loss-priority low code-points [ 010 011 ];
            }
            forwarding-class best-effort {
                loss-priority high code-points [ 000 001 ];
            }
        }
    }
    interfaces {
        fe-* {
            unit * {
                classifiers {
                    inet-precedence precedence-classifier;
                }
            }
        }
        t3-0/0/0 {
            scheduler-map qwest-map;
            unit * {
                classifiers {
                    inet-precedence precedence-classifier;
                }
            }
        }
    }
    scheduler-maps {
        qwest-map {
            forwarding-class network-control scheduler P1-scheduler;
            forwarding-class assured-forwarding scheduler P2-scheduler;
            forwarding-class expedited-forwarding scheduler P3-scheduler;
            forwarding-class best-effort scheduler P4-scheduler;
        }
    }
    schedulers {
        P1-scheduler {
            transmit-rate percent 20;
            priority high;
        }
        P2-scheduler {
            transmit-rate percent 20;
            priority high;
        }
        P3-scheduler {
            transmit-rate percent 20;
            priority medium-high;
        }
        P4-scheduler {
            transmit-rate percent 40;
            priority medium-low;
        }
    }
}
services {
    flow-monitoring;
}

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illforget
Asked:
illforget
1 Solution
 
GuruChiuCommented:
Typical QoS have a classifier to separate incoming traffic into different classes using varies criterials, and a scheduler to determine priority, bandwidth usage and drop probability. To further help in management, it is common to have pre-defined scheduler groups which the scheduler-maps can pick and choose to apply to each class.

In your particular case, incoming traffic going to your Ethernet and T1 will go through the classifier and mark into these classes:  network-control, assured-forwarding, expedited-forwarding & best-effort.
There are also four schedulers defined (P1 to P4), each have its bandwidth usage policy and priority. Finally the T1 was assign the scheduler-map qwest-map, which define which scheduler to use for each class of traffic.
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