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Quality of Service (QoS): Managing Bandwidth More Effectively
Using QoS Classifiers To Configure Quality of Service for Outbound Traffic
Figure 15-18 shows an example of the ToS byte in the header for an IP packet,
and illustrates the diffserv bits and precedence bits in the ToS byte. (Note that
the Precedence bits are a subset of the Differentiated Services bits.)
Field: Destination
MAC Address
Source MAC
Address
IP Identifier Type &
Version
ToS Byte . . .
Packet: FF FF FF FF FF FF 08 00 09 00 00 16 08 00 45
E 0 . . .
Differentiated Services Codepoint
Not
Used
Precedence
Bits
1 1
E 0
0 0 0 0 0 1
Figure 15-18. The ToS Codepoint and Precedence Bits
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