DiffServ
DiffServ, short for Differentiated Services, is a quality-of-service (QoS) architecture for IP networks that aims to provide scalable, per-hop treatment of packets by classifying and marking traffic rather than reserving resources end-to-end. It defines a Differentiated Services Field in the IP header and a set of Per-Hop Behaviors (PHBs) that routers should implement.
In DiffServ, edge devices classify packets and assign a DSCP (Differentiated Services Code Point) value in the
The main PHBs commonly used are Expedited Forwarding (EF), intended for low-loss, low-latency traffic such as
DiffServ was specified in standards such as RFC 2474 (Differentiated Services Field) and RFC 2475 (Architectural
Deployment considerations include the need for consistent policy and cooperative device support across network boundaries, risks