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RFC 2474 — Definition of the differentiated services field (DS field) in the IPv4 and IPv6 headers. Note that the DS field of 8 bits (the bottom two unused) in [ 2 ] was later split into the current 6-bit DS field and a separate 2-bit ECN field.
It is now called the "DS" (Differentiated Services, "DiffServ") field and the upper 6 bits contain a value called the "DSCP" (Differentiated Services Code Point). The upper 3 bits of DS maintains compatibility with IP Precedence. Since RFC 3168, the remaining two bits (the two least significant bits) are used for Explicit Congestion Notification.
The six most-significant bits hold the differentiated services field (DS field), which is used to classify packets. [ 2 ] [ 3 ] Currently, all standard DS fields end with a '0' bit. Any DS field that ends with two '1' bits is intended for local or experimental use. [ 4 ]
RFC 1058 (v.1), RFC 1388 (v.2), RFC 1723 (v.2), RFC 2453 (v.2), RFC 2080 (v.ng) Sender Policy Framework: RFC 4408 Secure Shell-2: RFC 4251 Session Announcement Protocol: RFC 2974 Session Description Protocol: RFC 2327 Session Initiation Protocol: RFC 3261 SHA hash functions: RFC 3174, RFC 4634 Simple Authentication and Security Layer: RFC 2222 ...
Differentiated services provides an additional method to select outgoing interfaces, based on a field that indicates the forwarding priority of the packet, as well as the preference of the packet to be dropped in the presence of congestion. Routers that support differentiated service not only have to look up the output interface for the ...
Traffic classification is an automated process which categorises computer network traffic according to various parameters (for example, based on port number or protocol) into a number of traffic classes. [1] Each resulting traffic class can be treated differently in order to differentiate the service implied for the data generator or consumer.
RFC 2638 from the IETF defines the entity of the Bandwidth Broker (BB) in the framework of differentiated services (DiffServ). According to RFC 2638, a Bandwidth Broker is an agent that has some knowledge of an organization's priorities and policies and allocates quality of service (QoS) resources with respect to those policies.
RFC 2211 - Specification of the Controlled-Load Network Element Service; RFC 2212 - Specification of Guaranteed Quality of Service; RFC 2215 - General Characterization Parameters for Integrated Service Network Elements; RFC 2205 - Resource ReSerVation Protocol (RSVP) Cisco.com, Cisco Whitepaper about IntServ and DiffServ