JUNIPER QOSJNCIA

QOS?

• Converged networks supports various applications and flows.

• Need to prioritize sensitive traffic

• Intserv, diffserv

MAIN QOS BUILDING BLOCKS

• Classification

• Marking

• Congestion management

• Congestion avoidance

• Traffic policing and shaping

• Link efficiency

DIFFSERV – L2Priority Code Point (PCP) for Ethernet encapsulation

PCP Priority Acronym Traffic Types

1 0 (lowest) BK Background

0 1 BE Best Effort

2 2 EE Excellent Effort

3 3 CA Critical Applications

4 4 VI Video, < 100 ms latency and jitter

5 5 VO Voice, < 10 ms latency and jitter

6 6 IC Internetwork Control

7 7 (highest) NC Network Control

DIFFSERV – L3

DSCP Class

DSCP (bin)

DSCP (dec)

IP precedence ToS (dec)

none 0 0 0 0cs1 1000 8 1 32af11 1010 10 1 40af12 1100 12 1 48af13 1110 14 1 56cs2 10000 16 2 64af21 10010 18 2 72af22 10100 20 2 80af23 10110 22 2 88cs3 11000 24 3 96af31 11010 26 3 104af32 11100 28 3 112af33 11110 30 3 120cs4 100000 32 4 128af41 100010 34 4 136af42 100100 36 4 144af43 100110 38 4 152cs5 101000 40 5 160ef 101110 46 5 184

cs6 110000 48 6 192cs7 111000 56 7 224

CLASSIFICATION

• Match traffic and put it into proper queue

• Firewall filtersuser@host# showfrom { protocol [ udp tcp ]; port 5060;}then { forwarding-class cos-voice; accept;}

MARKING

• Rewrites DSCP value with a new one per forwarding class

• Forwarding classes should be the same across whole network

• There is no special meaning of particular classes

[edit class-of-service]rewrite-rules { dscp rewrite-dscps { forwarding-class cos-voice { loss-priority low code-points ef; } forwarding-class cos-video { loss-priority low code-points cs5; } forwarding-class cos-critical { loss-priority low code-points af31; } forwarding-class cos-bulk { loss-priority low code-points af11; loss-priority high code-points cs1; } }}

CONGESTION MANAGEMENT

• Queuing mechanisms

• FIFO

• WFQ

• CBWFQ

• CBWFQ + PQ = LLQ

LLQ

CONGESTION AVOIDANCE

• RED

• WRED, CBWRED

• Configured as drop-profile under [edit class-of-service schedulers scheduler-name]

TRAFFIC SHAPING AND POLICING

• SINGLE TOKEN BUCKET

• DUAL TOKEN BUCKET (SINGLE RATE THREE COLOR MARKER)

• DUAL RATE TOKEN BUCKET (TWO RATE THREE COLOR MARKER)

[edit firewall]three-color-policer 1m-cir {

two-rate {committed-burst-

size 3k;committed-

information-rate 1m;peak-burst-size

3k;peak-

information-rate 2m;}

}

TWO RATE THREE COLOR MARKER

LAB

Task 1:

[ ] Mark and classify HTTP and ICMP traffic between C1 and C2.[ ] Use DSCP EF for HTTP traffic and assign it to Queue1.[ ] Use DSCP AF1x for ICMP traffic and assign it Queue2.[ ] Verify your setting on C1 and C2 in Wireshark.

Task 2:

[ ] Assign to EF traffic 10% of BW and assign it to strict priority queue.[ ] Assign to AF traffic 30% of BW.[ ] Use default BW assignment for NC and rest for BE.

root@JR1# show firewallfilter qos-marker { term icmp { from { source-address { 10.0.0.2/32; } protocol icmp; } then { forwarding-class expedited-forwarding; accept; } } term http { from { source-address { 10.0.0.2/32; } destination-port 80; } then { forwarding-class assured-forwarding; accept; } } term default { then accept; }}

root@JR1# show interfaces fe-0/0/3unit 0 { description To-PC1; family inet { filter { input qos-marker; } address 10.0.0.1/24; }}

root@JR1# show class-of-serviceinterfaces { fe-0/0/3 { unit 0 { classifiers { dscp default; } rewrite-rules { dscp default; } } }}

class-of-service {interfaces {

fe-* {scheduler-map

http-icmp-qos;}

}

schedulers {sched-ef {

transmit-rate percent 10;

buffer-size percent 10;

priority strict-high;

}sched-af {

transmit-rate percent 30;

buffer-size percent 30;

priority high;}sched-be {

transmit-rate percent 55;

buffer-size percent 55;

priority high;}sched-nc {

transmit-rate percent 5;

buffer-size percent 5;

priority high;}

}}

class-of-service {scheduler-maps {

http-icmp-qos {forwarding-class network-control scheduler

sched-nc;forwarding-class best-effort scheduler sched-

be;forwarding-class assured-forwarding scheduler

sched-af;forwarding-class expedited-forwarding

scheduler sched-ef;}

}}

END