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, âDefinition of the Differentiated Services Field in the IPv4 and IPv6 Headersâ
RFC 2597, âAssured Forwarding PHB Groupâ
RFC 2598, âAn Expedited Forwarding PHBâ
RFC 2698, âA Two Rate Three Color Markerâ
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