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Defining CoS BA Classifiers (DSCP, DSCP IPv6, IEEE 802.1p)

Overview

Packet classification associates incoming packets with a particular CoS servicing level. Behavior aggregate (BA) classifiers examine the Differentiated Services code point (DSCP or DSCP IPv6) value, the IEEE 802.1p CoS value, or the MPLS EXP value in the packet header to determine the CoS settings applied to the packet. (See Configuring a Global MPLS EXP Classifier to learn how to define EXP classifiers for MPLS traffic.) BA classifiers allow you to set the forwarding class and loss priority of a packet based on the incoming CoS value.

One most devices, unicast traffic uses different classifiers than multidestination (mulitcast, broadcast, and destination lookup fail) traffic. You use the multi-destination statement at the [edit class-of-service] hierarhcy level to configure a multidestination BA classifier.

Multidestination classifiers apply to all of the switch interfaces and handle multicast, broadcast, and destination lookup fail (DLF) traffic. You cannot apply a multidestination classifier to a single interface or to a range of interfaces.

Platform-specific Information

  • OCX Series switches do not support MPLS EXP classifiers.

  • On QFX10000 switches and NFX Series devices, unicast and multidestination traffic use the same classifiers and forwarding classes.

  • QFX5130, QFX5700 & QFX5220 switches do not support DSCP IPv6 classifiers and rewrite rules. However, you can apply DSCP classifiers and rewrite rules for IPV6 traffic as well.

Configuring BA Classifiers

To configure a DSCP, DSCP IPv6, or IEEE 802.1p BA classifier using the CLI:

  1. Create a BA classifier:

    • To create a DSCP, DSCP IPv6, or IEEE 802.1p BA classifier based on the default classifier, import the default DSCP, DSCP IPv6, or IEEE 802.1p classifier and associate it with a forwarding class, a loss priority, and a code point:

    • To create a BA classifier that is not based on the default classifier, create a DSCP, DSCP IPv6, or IEEE 802.1p classifier and associate it with a forwarding class, a loss priority, and a code point:

  2. For multidestination traffic, except on QFX10000 switches or NFX Series devices, configure the classifier as a multidestination classifier:
  3. Apply the classifier to a specific Ethernet interface or to all Ethernet interfaces, or to all Fibre Channel interfaces on the device.

    • To apply the classifier to a specific interface:

    • To apply the classifier to all Ethernet interfaces on the switch, use wildcards for the interface name and the logical interface (unit) number:

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