o Classification and conditioning
Packet is marked in TOS (IPv4) or TC (IPv6) field
6 bits for differentiated service code point (DSCP), 2 bits unused
May be desirable to limit traffic injection rate of some classes
User declares traffic profile (e.g. rate and burst size)
Traffic is metered and shaped if non-conforming
o Forwarding (per hop behaviour)
Does not specify what mechanism to ensure per hop behaviour
Results in measurable performance behaviour
Expedited forwarding (EF) departure rate of packets from a class specified guarantee
Assured forwarding (AF) 4 classes each with minimum amount of bandwidth and buffering
o Issues with DiffServ
AF and EF not yet standard
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