Junos OS

Hi all,

i'm somehow fresh to QoS/CoS concept and configurations, i went through many documents and teaching methods, but still dont get clear idea of how acheiving a task..

I have a 16Mb internet line connected to my J2320 port ge-0/0/0, users coming from ge-0/0/1 which is connected to SSG firewall doing private to public NAT and policies.

i want to give group of users 4Mb of the link when they need it, and the rest of the users can use 12Mb upto 16MB when the 4Mb is free, the good thing that this is a fresh nework and i can do anything i want on it..

Can please someone guide me through this.

Ok in 1st phase we will ensure upload bandwidth distribution for user groups and then in 2nd phase we will ensure download bandwidth distribution to user groups.

*******12 m to 16 m policer*************

edit firewall 

edit policer 12m-policer

set if-exceeding burst-size limit 300k

set if-exceeding bandwidth-limit 12m

set then out-of-profile

up

edit policer 16m-policer

set if-exceeding burst-size limit 500k

set if-exceeding bandwidth-limit 16m

set then discard

edit policer 4m-policer

set if-exceeding burst-size limit 125k

set if-exceeding bandwidth-limit 4m

set then discard

up

****Now configure firewall filiter*********

edit family ethernet-switching filter my-filter

set term 1 from interface----------***** configure match condition for 4m traffice*****

set term1  then forwarding-class assured-forwarding loss-priority low

set term 1 then policer 4m-policer next term

set term  2 from interface-----*******set match condtion for traffice 12-16m*******

set term 2 then forwarding-class best-effort loss-priority high

set term 2 then policer 12m-policer next term

set term  3 from interface-----*******set match condtion for traffice 12-16m*******

set term 3 then forwarding-class best-effort loss-priority high

set term 3  then policer 16m-policer accept

====Now apply firewall filter to appropriate ingress interface======

set interface ge-0/0/* unit 0 family ethernet-switching filter input my-filter

===Now coming to scheduler and rewrite rule part=====

edit class-of-service

set schedulers assured-fwd-scheduler priority  strict-high

up

set schedulers scheduler best-effort-scheduler buffer-size percent 40

set schedulers scheduler best-effort-scheduler priority low

up

set scheduler-map my-scheduler-map forwarding class assured-forwarding schedulers assured-fwd-scheduler

set scheduler-map my-scheduler-map forwarding class assured-forwarding schedulers best-effort-scheduler

up

exit
*******Uptill this portion incoming bandwifth is ensured************

*****Now output banwidth distribution*********
 set interface ge-0/0/* (egress interface to SSG) family ethernet-switching filiter output my-filiter

 also visit http://forums.juniper.net/t5/Ethernet-Switching/CoS-on-EX-Series-Switches/m-p/216951, my earlier post on CoS it will be helpful for your

Mark this as accepted solution if it works for you

A Kudos is a good way of appreciation

Kashif Nawaz

JNCIP-Sec JNCIS-Sec JNCIS-Ent JNCIA-Junos