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
Trio scheduling, priority handling, and load balancing
MX CoS defaults
Predicting queue throughput
Per-unit Scheduling CoS lab
Hierarchical CoS lab