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Juniper MX Series by Harry Reynolds, Douglas Richard Hanks Jr.

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Chapter 5. Trio Class of Service

This chapter explores the vast and wonderful world of Class of Service (CoS) on Trio-based PFEs. A significant portion of the chapter is devoted to its highly scalable hierarchical CoS (H-CoS) capabilities.

Readers that are new to general IP CoS processing in Junos or who desire a review of IP Differentiated Services (DiffServ) concepts should consult the Juniper Enterprise Routing book. CoS is a complicated subject, and the intent is to cover new, Trio-specific CoS capabilities without dedicating invaluable space to material that is available elsewhere.

The CoS topics in this chapter include:

  • MX router CoS capabilities

  • Trio CoS flow

  • Hierarchical CoS

  • Trio scheduling, priority handling, and load balancing

  • MX CoS defaults

  • Predicting queue throughput

  • Per-unit Scheduling CoS lab

  • Hierarchical CoS lab

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