IP Precedence

IP precedence is a method to assign priority to data packets by using part of the Type of Service field in the IP datagram header.

With IP precedence, the first three bits of the TOS field is used to provide one of eight possible precedence values.

Binary	Value	Priority
000	(0)	Routine
001	(1)	Priority
010	(2)	Immediate
011	(3)	Flash
100	(4)	Flash Override
101	(5)	Critical
110	(6)	Internetwork Control
111	(7)	Network Control