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Example: Enabling Eight Queues on ATM2 IQ Interfaces

In Figure 21, Router A generates IP packets with different IP precedence settings. Router B is an M320 or T-series platform with two ATM2 IQ interfaces. On Router B, interface at-6/1/0 receives traffic from Router A, while interface at-0/1/0 sends traffic to Router C. This example shows the CoS configuration for Router B.

Figure 21: Example Topology for Router with Eight Queues

Image g015530.gif

On Router B:



[edit chassis]
fpc 0 {


pic 1 {
max-queues-per-interface 8;
}


}
fpc 6 {


pic 1 {
max-queues-per-interface 8;
}


}
 
[edit interfaces]
at-0/1/0 {


atm-options {


linear-red-profiles {
red_1 queue-depth 1k high-plp-threshold 50 low-plp-threshold
80;
red_2 queue-depth 2k high-plp-threshold 40 low-plp-threshold
70;
red_3 queue-depth 3k high-plp-threshold 30 low-plp-threshold
60;
red_4 queue-depth 4k high-plp-threshold 20 low-plp-threshold
50;
}




scheduler-maps {


sch_red {
vc-cos-mode strict;


forwarding-class fc_q0 {
priority high;
transmit-weight percent 5;
linear-red-profile red_1;
}




forwarding-class fc_q1 {
priority low;
transmit-weight percent 10;
linear-red-profile red_2;
}




forwarding-class fc_q2 {
priority low;
transmit-weight percent 15;
linear-red-profile red_3;
}




forwarding-class fc_q3 {
priority low;
transmit-weight percent 20;
linear-red-profile red_4;
}




forwarding-class fc_q4 {
priority low;
transmit-weight percent 5;
linear-red-profile red_1;
}




forwarding-class fc_q5 {
priority low;
transmit-weight percent 10;
linear-red-profile red_2;
}




forwarding-class fc_q6 {
priority low;
transmit-weight percent 15;
linear-red-profile red_3;
}




forwarding-class fc_q7 {
priority low;
transmit-weight percent 20;
linear-red-profile red_4;
}


}




sch_epd {
vc-cos-mode alternate;


forwarding-class fc_q0 {
priority high;
transmit-weight percent 5;
epd-threshold 1024;
}




forwarding-class fc_q1 {
priority low;
transmit-weight percent 10;
epd-threshold 2048;
}




forwarding-class fc_q2 {
priority low;
transmit-weight percent 15;
epd-threshold 3072;
}




forwarding-class fc_q3 {
priority low;
transmit-weight percent 20;
epd-threshold 4096;
}




forwarding-class fc_q4 {
priority low;
transmit-weight percent 5;
epd-threshold 2048;
}




forwarding-class fc_q5 {
priority low;
transmit-weight percent 10;
epd-threshold 3072;
}




forwarding-class fc_q6 {
priority low;
transmit-weight percent 15;
epd-threshold 4096;
}




forwarding-class fc_q7 {
priority low;
transmit-weight percent 20;
epd-threshold 5120;
}


}


}


}




atm-options {
vpi 0;
}




unit 0 {
vci 0.100;


shaping {
cbr 1920000;
}


atm-scheduler-map sch_red;


family inet {
address 172.16.0.1/24;
}


}




unit 1 {
vci 0.101;


shaping {
vbr peak 1m sustained 384k burst 256;
}


atm-scheduler-map sch_epd;


family inet {
address 172.16.1.1/24;
}


}


}
at-6/1/0 {


atm-options {
vpi 0;
}




unit 0 {
vci 0.100;


family inet {
address 10.10.0.1/24;
}


}




unit 1 {
vci 0.101;


family inet {
address 10.10.1.1/24;
}


}


}
 
[edit class-of-service]
classifiers {


inet-precedence inet_classifier {


forwarding-class fc_q0 {
loss-priority low code-points 000;
}




forwarding-class fc_q1 {
loss-priority low code-points 001;
}




forwarding-class fc_q2 {
loss-priority low code-points 010;
}




forwarding-class fc_q3 {
loss-priority low code-points 011;
}




forwarding-class fc_q4 {
loss-priority low code-points 100;
}




forwarding-class fc_q5 {
loss-priority low code-points 101;
}




forwarding-class fc_q6 {
loss-priority low code-points 110;
}




forwarding-class fc_q7 {
loss-priority low code-points 111;
}


}




forwarding-classes {
queue 0 fc_q0;
queue 1 fc_q1;
queue 2 fc_q2;
queue 3 fc_q3;
queue 4 fc_q4;
queue 5 fc_q5;
queue 6 fc_q6;
queue 7 fc_q7;
}




interfaces {


at-6/1/0 {


unit * {


classifiers {
inet-precedence inet_classifier;
}


}


}


}


}
[edit routing-options]
static {


route 10.10.20.2/32 {
next-hop at-0/1/0.0;
retain;
no-readvertise;
}




route 10.10.1.2/32 {
next-hop at-0/1/0.1;
retain;
no-readvertise;
}


}

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