Junos OS

As on Junose to rewrite value ip precedense,

Example on Cisco

class-map match-all be
    match ip precedence 0
!
!
policy-map be
  class be
   set ip precedence 5
!

interface Ethernet0/0
 description out

 ip address 10.100.2.2 255.255.255.252
 ip directed-broadcast
 half-duplex
 service-policy output be

As we see all simply

thanks

Hi,

if you use your own forwarding classes then just replece the names. ge-0/0/0 is egress interface in this example. If it is a EX switch then you would need Junos 9.5 for this configuration.

lab@M7i-loanunit-mpergament# show class-of-service
interfaces {
    ge-0/0/0 {
        unit 0 {
            rewrite-rules {
                inet-precedence ipprec0;
            }
        }
    }
}
rewrite-rules {
    inet-precedence ipprec0 {
        forwarding-class assured-forwarding {
            loss-priority low code-point 000;
            loss-priority high code-point 000;
        }

    inet-precedence ipprec0 {
        forwarding-class best-effort {
            loss-priority low code-point 000;
            loss-priority high code-point 000;
        }

    inet-precedence ipprec0 {
        forwarding-class expedited-forwarding {
            loss-priority low code-point 000;
            loss-priority high code-point 000;
        }

    inet-precedence ipprec0 {
        forwarding-class network-control {
            loss-priority low code-point 000;
            loss-priority high code-point 000;
        }
    }

P.S. If it works for you then please mark it as worked solution + Kudo would be good.

Regards

Michael Pergament

Btw this example would rewrite IP PREC for all forwarding classes to 0. Otherwise you could use default inet-precedence rewrite rule:

lab@M7i-loanunit-mpergament# run show class-of-service rewrite-rule type inet-precedence
Rewrite rule: ipprec-default, Code point type: inet-precedence, Index: 35
  Forwarding class                    Loss priority       Code point
  best-effort                         low                 000           
  best-effort                         high                000           
  expedited-forwarding                low                 101           
  expedited-forwarding                high                101           
  assured-forwarding                  low                 001           
  assured-forwarding                  high                001           
  network-control                     low                 110           
  network-control                     high                111   

Which would actually rewrite all BE traffic to 0 per default!

lab@M7i-loanunit-mpergament# set class-of-service interfaces ge-0/0/0 unit 0 rewrite-rules inet-precedence default 

Regards

Michael

amtel@test1> show version
Hostname: test1
Model: j4350
JUNOS Software Release [8.5R1.13] (Export edition

class-of-service {
    forwarding-classes {
        queue 0 f0;
        queue 1 f1;
        queue 2 f2;
---     queue 3 f3;
        queue 4 f4;
        queue 5 f5;
        queue 6 f6;
        queue 7 f7;
    }
    interfaces {
        ge-0/0/1 {
            unit 0 {
                scheduler-map map;
                shaping-rate 10m;
                rewrite-rules {
                    dscp BE;
                }
            }
        }
    }
    rewrite-rules {
        dscp BE {
            forwarding-class f1 {
                loss-priority high code-point 000000;
            }
        }
                       }
    scheduler-maps {
        map {
            forwarding-class f0 scheduler F0;
            forwarding-class f1 scheduler F1;
            forwarding-class f2 scheduler F2;
            forwarding-class f3 scheduler F3;
            forwarding-class f4 scheduler F4;
            forwarding-class f5 scheduler F5;
            forwarding-class f6 scheduler F6;
            forwarding-class f7 scheduler F7;
        }
    }
    schedulers {
        F0 {
            transmit-rate percent 30;
            buffer-size percent 10;
            priority low;
        }
        F1 {
            transmit-rate percent 10;
            buffer-size percent 10;
            priority low;
                           }
        F2 {
            transmit-rate percent 10;
            buffer-size percent 10;
            priority low;
        }
        F3 {
            transmit-rate percent 10;
            buffer-size percent 10;
            priority low;
        }
        F4 {
            transmit-rate percent 10;
            buffer-size percent 10;
            priority medium-high;
        }
        F5 {
            transmit-rate percent 10;
            buffer-size percent 10;
            priority medium-high;
        }
        F6 {
            transmit-rate percent 10;
            buffer-size percent 10;
            priority medium-low;
        }
        F7 {
            transmit-rate percent 10;
            buffer-size percent 5;
            priority strict-high;
        }

firewall {
    family inet {
        filter BE {
            term 1 {
                from {
                    dscp [ cs5 ef ];
                }
                then {
                    loss-priority medium-low;
                    forwarding-class f1;
                    accept;
                }
            }

      
No works -(((

on which ingress interface did you apply this filter? Did you apply it at all?

Regards

Michael

Yes

interfaces {
ge-0/0/0 {
        unit 0 {
            family inet {
                filter {
                    input BE;
                }
                address 10.200.27.3/24 {
                    vrrp-group 1 {
                        virtual-address 10.200.27.1;
                        priority 120;
                        no-preempt;
                    }

 Queue counters:       Queued packets  Transmitted packets      Dropped packets
    0 f0                             0                    0                    0
    1 f1                            64                   64                    0
    2 f2                             0                    0                    0
    3 f3                             0                    0                    0
    4 f4                             0                    0                    0
    5 f5                             0                    0                    0
    6 f6                             0                    0                    0
    7 f7                             0                    0                    0
  Active alarms  : None
  Active defects : None

Packages get to f1 interf-ge-0/0/1

Ok. So what does not work (traffic is going out on the right queue according toyour FF)? Rewriting? You assigned loss-prio medium-low within your FF but use prio highwithin rewrite-rule which is not really consistent! Change  loss-prio within your FF to higg then you would see rewriting at work.

Regards

Michael Pergament

Please mark it as a Working Solution. Thanks!

Michael Pergament