Note
DiffServ classes of service are not be confused with Layer 2 classes of service for Inter-Switch (ISL), or 802.1Q frame-marking services on local-area networks. This chapter only uses the te class of service to refer to Layer 3 packet marking.
|
Hexadecimal Bits |
Decimal Value |
Type of Service |
Cisco IOS Software ToS Valu |
|
0000 |
0 |
Normal |
no rmal |
|
1000 |
8 |
Minimize delay |
min-dela y |
|
0100 |
4 |
Maximize throughput |
max-t1roug1put |
|
00 10 |
2 |
Maximize re liability |
max-reliability |
|
0001 |
1 |
Minimi ze cost |
min-monetary-cost |
Using the ToS values, it is possible to mark packets from certain applications and use that classifica information l ater in the network when congest ion is encountered to provide these applications with levels of serv ice. By defau I t, all I P packets have a ToS value nf 0000, spetifying th at ehey should be with a normal " beat-effort" s ervice leve L With Ciscn IOS Software. it is possible to ch ange the ToS define appl i cation traffic us 1 ng hccess lists, as shown in Examp1 e 5-20. Using eccess H sts, you can c ToS value for packet. usin g the ToS value name or a decimal valee ranging from 0 to 15.
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