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Class of Service on demux Interfaces

SUMMARY 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 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.

  1. Configure a classifier and apply it to a demux logical interface.
  2. Configure a rewrite rule and apply it to a demux logical interface.
  3. Configure a traffic control profile and apply it to the underlying AE interface.
  4. Commit and show the configuration.

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.