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Class of Service on demux Interfaces

date_range 25-Sep-24

This topic describes class of service (CoS) functionality and configuration on demux interfaces. demux interfaces support basic CoS functionality including behavior aggregate (BA) classifiers, rewrite rules, fixed classification, and port-level scheduling with targeted distribution.

Demultiplexing (demux) interfaces are logical interfaces that share a common, underlying interface. You can create logical subscriber interfaces using static or dynamic demultiplexing interfaces. In addition, you can use IP demultiplexing interfaces or VLAN demultiplexing interfaces when creating logical subscriber interfaces.

Overview of CoS on demux Interfaces

demux interfaces support basic CoS functionality, including:

Classifiers including INET precedence, DSCP, IEEE 802.1p, and IEEE 802.1ad
Rewrite rules including INET precedence, DSCP, IEEE 802.1p, and IEEE 802.1ad
Fixed classification

Note:

demux interfaces do not support MPLS EXP classifiers or rewrite rules.

Figure 1 shows the demux interface (demux0) with an underlying aggregated Ethernet (AE) interface. You can assign classifiers and rewrite rules to the logical interfaces (demux0.x) of the demux interface. You can then configure schedulers, scheduler maps, traffic control profiles, and so on, for the underlying AE interface.

Figure 1: demux interface with an underlying aggregated Ethernet interface

Configuring CoS on demux Interfaces

This section provides a simple example of how to configure a classifier and a rewrite rule for demux logical interfaces as well as a traffic control profile for the underlying AE interface.

Configure a classifier and apply it to a demux logical interface.

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[edit class-of-service]
user@host# set classifiers ieee-802.1ad test forwarding-class expedited-forwarding loss-priority low code-points 0000
user@host# set interfaces demux0 unit 0 classifiers ieee-802.1ad test

Configure a rewrite rule and apply it to a demux logical interface.

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[edit class-of-service]
user@host# set rewrite-rules ieee-802.1ad test forwarding-class expedited-forwarding loss-priority low code-point 1011
user@host# set interfaces demux0 unit 1 rewrite-rules ieee-802.1ad test

Configure a traffic control profile and apply it to the underlying AE interface.

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[edit class-of-service]
user@host# set schedulers s1 shaping-rate 500m
user@host# set scheduler-maps testmap forwarding-class expedited-forwarding scheduler s1
user@host# set traffic-control-profiles tcp1 scheduler-map testmap
user@host# set interfaces ae0 output-traffic-control-profile tcp1
user@host# set interfaces ae0 member-link-scheduler replicate

Commit and show the configuration.

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[edit class-of-service]
user@host# commit
user@host# show
classifiers {
    ieee-802.1ad test {
        forwarding-class expedited-forwarding {
            loss-priority low code-points 0000;
        }
    }
}
traffic-control-profiles {
    tcp1 {
        scheduler-map testmap;
    }
}
interfaces {
    ae0 {
        output-traffic-control-profile tcp1;
        member-link-scheduler replicate;
    }
    demux0 {
        unit 0 {
            classifiers {
                ieee-802.1ad test;
            }
        }
        unit 1 {
            rewrite-rules {
                ieee-802.1ad test;
            }
        }
    }
}
rewrite-rules {
    ieee-802.1ad test {
        forwarding-class expedited-forwarding {
            loss-priority low code-point 1011;
        }
    }
}
scheduler-maps {
    testmap {
        forwarding-class expedited-forwarding scheduler s1;
    }
}
schedulers {
    s1 {
        shaping-rate 500m;
    }
}

In the very simple example above, IEEE802.1ad traffic arriving on demux0.0 with a code point of 0000 is assigned a forwarding class of expedited-forwarding and a loss priority of low. Through the traffic control profile, this traffic has up to 500 Mb of bandwidth as it traverses the router. Upon exiting the router through demux0.1, the traffic's code point is rewritten to 1011.

arrow_backward PREVIOUS Enabling VLAN Shaping and Scheduling on Aggregated Interfaces

NEXT arrow_forward Example: Configuring Per-Unit Schedulers for Channelized Interfaces

Class of Service User Guide (Routers and EX9200 Switches)

ON THIS PAGE

Class of Service on demux Interfaces

Overview of CoS on demux Interfaces

Configuring CoS on demux Interfaces

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