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Figure 12-1.802.1 QoS of 802.1p
● QoS of IP Precedence
QoS of IP Precedence makes use of the highest three digits in TOS of IP data packet head as its
PRI, please refer to Figure 12-2. The range of IP Precedence is from 0 to 7. QoS of IP
Precedence was used more in early times, but now it has been replaced by DiffServ.
● QoS of DiffServ
QoS of DiffServ makes use of DSCP as its PRI sign, DSCP locates the highest 6 digits of TOS
field in IP data packet head.
Figure 12-2 PRI Digit of IP Precedence and DiffServ
At the bounerline of QoS field, to sign different PRI signs in different data flow based on QoS
configuration policy of the switch, i.e. the operation sign, in QoS field all devices according to
operation signs tranfer to the data flow. Thus devices in QoS field needs not to be carried out
with complex flow classification and complex QoS policy, to carry out PRU processing with
operation signs is OK.
Switch in QoS field bcommandline can not only put the data flow into operation but also carry out
bandwidth processing for operation when data flow enter into the bcommandline of QoS field, for
example obligate bandwidth resources or limite the bandwidth, which can ensure that bandwidth
resources in QoS field can be fully used.
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