DiffServ Vs IP Precedence

DiffServ utilises what are known as DSCP (Differentiated Services Code Points), where the 6 most significant bits of the IP packet ToS field are used to implement PHB (Per Hop Behaviour) policy for different types of traffic with different PHB requirements. Because the number of bits have been increased from 3 to 6, we know have potentially a lot more levels of priority to play with. RFC (Request for Comments) standards 2474 and 2475 are the Internet standards that refer to DiffServ. The DSCP make up the 6 most significant bits of the ToS field in the IP packet, with the remaining two bits now being identified for use as Explicit Congestion Notification bits. A device at the edge of a network will be used to classify and mark the packets. Although this is usually a router at the edge of the network, in some instances the end device such as an IP Phone or Video device may be able to mark the packets prior to being received by the edge router. Intermediate routers in the network can use the DSCP marking to make decisions based on how they have been configured, to select a certain PHB to ensure a flow of packets receives the correct treatment in the network the will allow the application to function as it was designed. eTQyxtTv
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