Contemporary Control Systems Compact Managed Switches Software Manual for Web Browser - Manual (Page 38)

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Lower Table — Map DiffServ DSCP and Priority Queue
Sometimes called the “second generation of Internet QoS”, Differentiated Services
(DiffServ) was first described by RFC2474 which redefines the TOS octet to allocate its
first six bits as the Differentiated Services Code Point (DSCP). The DSCP field
selects the per-hop behaviour (PHB) which defines how packets are queued at network
nodes. RFC 2475 describes DiffServ methods for implementing scalable differentiated
services on the Internet.
Figure 33 — Map DiffServ DSCP and Priority Queue