[j-nsp] Rewriting ToS on the edge

[Richmond, Jeff (ELI)]

Jerome, you would want something along these lines I believe (I am using EXP
here, but you just need to substitute for DSCP or Precedence). I believe
this worked fine last time I tested it, but it has been a while. Basically,
I am taking anything marked 010 or 011 and rewriting it to 010, and 000 I am
leaving at 000.

class-of-service {
    classifiers {
        exp TEST-EXP-CLASSIFIER {
            forwarding-class HIGH-PRIORITY {
                loss-priority low code-points 010;
                loss-priority high code-points 011;
            }
            forwarding-class BEST-EFFORT {
                loss-priority low code-points 000;
            }
        }
    }
    interfaces {
        so-* {
            unit 0 {
                scheduler-map TEST-SCHED-MAP;
                classifiers {
                    exp TEST-EXP-CLASSIFIER;
                }
                rewrite-rules {
                    exp TEST-EXP-REWRITE;
                }
            }
        }
    }
    rewrite-rules {
        exp TEST-EXP-REWRITE {
            forwarding-class HIGH-PRIORITY {
                loss-priority low code-point 010;
            }
            forwarding-class BEST-EFFORT {
                loss-priority low code-point 000;
            }
        }
    }

-Jeff

-----Original Message-----
From: Jerome Fleury [mailto:jeje at jeje.org]
Sent: Monday, December 13, 2004 6:54 AM
To: juniper-nsp at puck.nether.net
Subject: [j-nsp] Rewriting ToS on the edge


Hi there,

I'm looking for a simple way to rewrite the ToS of every incoming packet on
an interface (edge
interface) to 0. As I understand the Juniper philosophy, I should mark it on
the incoming
interface, and rewrite the ToS on each output interface.

This looks a bit tricky for such a simple task. Is there any shortcut for
that ?

Thanks.

Jerome Fleury.
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