[j-nsp] Setting CoS bits on ingress frames

[Victor Sudakov]

Alexander Arseniev wrote:
> > The FC in JUNOS is the same as "qos-group" in CSCO IOS - invisible 
> > internal-only field which travels along with packet content across the 
> > switch, but is never inserted in the actual packet. The FC has 
> > significance for choosing output scheduling, RED drop, marking.


I have come across a problem with the fixed port classifier.

I would be grateful if someone could help me out. My lab setup is at 
ftp://ftp.sibptus.ru/pub/vas/lab2.pdf

Normally I see frames from HostA arriving at HostC with COS=3. I also
want frames from HostB to arrive at HostC with COS=6.

However, when I enable the rewrite-rules section at Sw3, frames from
HostA no more have COS=3 (i.e. the COS field is cleared).

I am ready to provide any additional detail. Below is my QoS
configuration.


admin at sw-kedr> show configuration class-of-service | no-more 
forwarding-classes {
    queue 0 bk;
    queue 1 be;
    queue 2 ee;
    queue 3 ca;
    queue 4 vi;
    queue 5 vo;
    queue 6 ic;
    queue 7 nc;
}
interfaces {
    ge-0/0/0 {
        unit 0 {
            forwarding-class ic;
        }
    }
    inactive: ge-0/0/22 {
        unit 0 {
            rewrite-rules {
                ieee-802.1 output;
            }
        }
    }
    ge-0/0/23 {
        unit 0 {
            rewrite-rules {
                ieee-802.1 output;
            }
        }
    }
}
rewrite-rules {
    ieee-802.1 output {
        forwarding-class bk {
            loss-priority high code-point 000;
            loss-priority low code-point 000;
        }
        forwarding-class be {
            loss-priority high code-point 001;
            loss-priority low code-point 001;
        }
        forwarding-class ee {
            loss-priority high code-point 010;
            loss-priority low code-point 010;
        }
        forwarding-class ca {
            loss-priority high code-point 011;
            loss-priority low code-point 011;
        }
        forwarding-class vi {
            loss-priority high code-point 100;
            loss-priority low code-point 100;
        }
        forwarding-class vo {
            loss-priority high code-point 101;
            loss-priority low code-point 101;
        }
        forwarding-class ic {
            loss-priority high code-point 110;
            loss-priority low code-point 110;
        }
        forwarding-class nc {
            loss-priority high code-point 111;
            loss-priority low code-point 111;
        }
    }
}

{master:0}
admin at sw-kedr> 

-- 
Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
sip:sudakov at sibptus.tomsk.ru