Class of Service Overview

The CoS configuration available for the AS PIC enables you to configure Differentiated Services (DiffServ) code point (DSCP) marking and forwarding-class assignment for packets transiting the AS PIC. You can configure the CoS service alongside the stateful firewall and NAT services, using a similar rule structure. The component structures are described in detail in the JUNOS Class of Service Configuration Guide.

Standards for Differentiated Services are described in the following documents:

• RFC 2474, Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers
• RFC 2475, An Architecture for Differentiated Services

  Note: CoS BA classification is not supported on services interfaces.

For more information about configuring CoS services, see Class-of-Service Configuration Guidelines.