Table 5-3 Ip Precedence Values; Table 5-4 Tos Field With Ip Precedence Bits - NEC Univerge SV9100 Manual

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Table 5-4 ToS Field with IP Precedence Bits

IP Precedence
1(on) here = value of 4 1(on) here = value of 2 1(on) here = value of 1
SV9100 Networking Manual
IP Precedence
IP precedence uses the first three bits of the ToS field to give eight possible
precedence values (0~7). Under normal circumstances, the higher the
number, the higher the priority. However, the administrator can assign these
precedence values with the lower values having a higher priority.
The following table shows the eight common values for IP precedence.

Table 5-3 IP Precedence Values

TOS Field
000
001
002
003
004
005
006
007
Working in conjunction with IP precedence, the next four bits in the ToS field
influence the delivery of data based on the following:
delay
throughput
reliability
cost
However these fields are usually not used. The following table shows the
eight bit ToS field and the associated IP precedence bits.
IP Precedence
Precedence
Precedence
Higher Number Value Correlates
Value
0
Routine or Best Effort
1
Priority
2
Immediate
3
Flash
4
Flash Override
5
Critical
6
Internetwork Control
7
Network Control
IP
Throughp
Delay
to Higher Priority
Reliabilit
Cost
ut
y
Not
Used
5-11

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