Packet Marking
Packet marking involves the
manipulation of a 1-byte (8-bit) field within the IP packet header called the
type of service, or ToS, byte. Network devices use this byte of data to
determine the relative priority and handling requirements of incoming packets.
The ToS byte contains data for one of two widely adopted mechanisms:
In either case, a series of bits
is flagged within the ToS byte to identify the relative priority and handling
requirements of the packet. Accurate handling of marked packets can be ensured
only when adjacent devices are in agreement about how packets are handled based
on their marking. Figure 3-10 shows the
IP packet header containing the ToS byte.
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