Chapter 9. Class of Service

This chapter details M7i and J-series class of service (CoS) capabilities while also demonstrating typical CoS configuration and verification steps under JUNOS software. A detailed comparison between the ASIC-based M7i and the software-based J-series platform is provided to clarify their operational differences, which is a common source of confusion given that they have so many similarities. The topics covered include:

  • What IP CoS is and why it is needed

  • IP differentiated services primer

  • M7i and J-series CoS capabilities

  • DiffServ-based CoS deployment and verification

  • J-series virtual channels

Juniper Networks routers offer extensive support for IP CoS. As of this writing, the list of supported standards includes:

  • RFC 2474, “Definition of the Differentiated Services Field in the IPv4 and IPv6 Headers”

  • RFC 2597, “Assured Forwarding PHB Group”

  • RFC 2598, “An Expedited Forwarding PHB”

  • RFC 2698, “A Two Rate Three Color Marker”

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