Switching

Hi -

I'm trying to get up to speed on CoS and having some trouble. I've configured some MF Classifiers on an EX2200 and want to set a dscp value to incoming packets.

I've read the EX2200 does not support MF Classifiers on a per interface bassis and now I'm confused as to how I would mark dscp values to incoming packets based on traffic classification i.e. voice/video/be.

My configuration is based on this Juniper example.

https://www.juniper.net/techpubs/en_US/junos9.3/topics/example/cos-ex-series-configuring.html

Appreciate any insight.

Thanks

Hi, I think you need to configure re-write rules for marking DSCP.

The following is an example, but I configured on EX3200 / 4200. This should work in EX2200.

[edit class-of-service]

rewrite-rules {
    dscp MARK-DSCP {
        forwarding-class assured-forwarding {
            loss-priority low code-point af21;
            loss-priority high code-point af23;
        }
        forwarding-class expedited-forwarding {
            loss-priority high code-point ef;
        }
    }
}

interfaces {
    ge-0/0/0 {
        unit 55 {
            rewrite-rules {
                dscp MARK-DSCP;
            }
        }
    }
}

Try this way, and let us know.

Regards

Moses N

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Hi Moses - Apologies for such a delayed follow-up. Your absolutely correct about the re-write rules. That's definately the way to mark the packets.

I also finally realized I needed to use the MF Classifer on the VLAN and not the interface. The EX2200 does not support MF Classifiers on a per interface basis but it does for the VLAN which is exactly what I needed. Then to mark the dscp value I need the re-write rules. My config looks like this..

rewrite-rules {
    dscp dscp_46 {
        forwarding-class voice {
            loss-priority low code-point ef;
        }
    }
}

Thanks again for the help.