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DiffServ uses a 6-bit differentiated services code point (DSCP) in the 6-bit differentiated services field (DS field) in the IP header for packet classification purposes. The DS field, together with the ECN field, replaces the outdated IPv4 TOS field.
RFC 2474 (which was released in December 1998) reserved the first six bits of the DS (or IPv4 ToS) field for the Differentiated Services Code Point (DSCP), and RFC 3168 reserved the last two bits for Explicit Congestion Notification.
A multilayer switch can prioritize packets by the 6 bit differentiated services code point (DSCP). These 6 bits were originally used for type of service. The following 4 mappings are normally available in an MLS: [citation needed] From OSI layer 2, 3 or 4 to IP DSCP (for IP packets) or IEEE 802.1p; From IEEE 802.1p to IP DSCP; From IP DSCP to ...
Differentiated services code point (DSCP) markings use the first 6 bits in the ToS field (now renamed as the DS field) of the IP(v4) packet header. Early work used the integrated services (IntServ) philosophy of reserving network resources. In this model, applications used RSVP to request and reserve resources through a network.
Differentiated Services Code Point (DSCP): 6 bits This field is copied from the inner IP header. Explicit Congestion Notification (ECN): 2 bits This field is copied from the inner IP header. Total Length: 16 bits This field is the length of the encapsulated IP packet (including Outer IP Header, Inner IP Header, IP Payload). Identification: 16 bits
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Differentiated Services Code Point (DSCP): 6 bits Originally defined as the type of service (ToS), this field specifies differentiated services (DiffServ). [34] Real-time data streaming makes use of the DSCP field. An example is Voice over IP (VoIP), which is used for interactive voice services. Explicit Congestion Notification (ECN): 2 bits