Chapter 10. Class of Service
This chapter details class of service (CoS) capabilities while also demonstrating typical CoS configuration and verification steps under the Junos operating system. A detailed comparison between the ASIC-based and the software-based 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
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 3246, “An Expedited Forwarding PHB”
RFC 2698, “A Two Rate Three Color Marker”
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