MARITIME TACTICAL WIDE AREA NETWORKING (MTWAN ...

Uncontrolled copy when printedHIGHERPROBABLIDLIYT THEPACKETS WILL BEDROPPEDUNCLASSIFIEDACP 200(B) Vol 2ASSURED FORWARDING SERVICES CLASSESHIGHER PRIORITY TRAFFIC CLASSESClass 1 Class 2 Class 3 Class 4Low Drop Precedence AF11 AF21 AF31 AF41Medium Drop Precedence AF12 AF22 AF32 AF42High Drop Precedence AF13 AF23 AF33 AF43Table 2-1AF Service Classes237. Class 1 traffic is lower priority than class 2 traffic and so on. The drop precedencemeans that packets with high drop precedence are more likely to be dropped in router queuesthan those with low drop precedence. With this order AF41 is the highest priority and AF13 isthe lowest priority.238. Differentiated Services Code Point (DSCP) is a field in the header of IP packets forpacket classification purposes in a MTWAN. A higher DSCP value results in better packettreatment during times of network congestion, resulting in lower probability of packets beingdropped and less delay.2-9 OriginalUNCLASSIFIED