J-series™ Services Router Configuration Guide

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Configuring Class of Service with DiffServ

You configure class of service (CoS) with Differentiated Services (DiffServ) when you need to override the default packet forwarding behavior of a Services Router—especially in the three areas identified in Table 149.

Table 149: Reasons to Configure Class of Service (Cos) with DiffServ

Packet classification—By default, the Services Router does not use DiffServ to classify packets. Packet classification applies to incoming traffic.	Classifiers
Scheduling queues—By default, the Services Router has only two queues enabled. Scheduling queues apply to outgoing traffic.	Schedulers
Packet headers—By default, the Services Router does not rewrite CoS bits in packet headers. Rewriting packet headers applies to outgoing traffic.	Rewrite rules

You can use either the J-Web configuration editor or CLI configuration editor to configure CoS with DiffServ. The J-Web interface does not include Quick Configuration pages for CoS or DiffServ.

This chapter contains the following topics. For more information about CoS and DiffServ, see the JUNOS Network Interfaces and Class of Service Configuration Guide.

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