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Diffserv Context The IETF diffserv RFCs define the layout of the DS field: the IPv4 TOS octet the IPv6 Traffic Class octet IETF RFC 2474 and RFC 2475 approved in December 1998 IETF RFC2481 approved in January 1999 as experimental, deprecated by standard track RFC 3168 in September 2001 0 1 2 3 4 5 6 7 +---+---+---+---+---+----+---+---+ | DSCP |ECN bits| +---+---+---+---+---+----+---+---+ DS field structure DSCP: differentiated services codepoint ECN: Explicit Congestion Notification, RFC 2481, now RFC3168 |