HP 830 Series User Manual

470
Packet precedences
IP precedence and DSCP values
Figure 478 ToS field and DS field
As shown in Figure 478, the ToS field of the IP header contains eight bits: the first three bits (0 to 2)
represent IP precedence from 0 to 7. The subsequent four bits (3 to 6) represent a ToS value from 0 to 15.
According to RFC 2474, the ToS field of the IP header is redefined as the differentiated services (DS) field,
where a differentiated services code point (DSCP) value is represented by the first six bits (0 to 5) and is
in the range 0 to 63. The remaining two bits (6 and 7) are reserved.
Table 143 Description on IP Precedence
IP Precedence (decimal) IP Precedence (binar
y
) Descri
p
tion
0 000 routine
1 001 priority
2 010 immediate
3 011 flash
4 100 flash-override
5 101 critical
6 110 internet
7 111 network
Table 144 Description on DSCP values
DSCP value (decimal) DSCP value (binar
y
) Descri
p
tion
46 101110 ef
10 001010 af11
12 001100 af12
14 001110 af13
18 010010 af21
20 010100 af22
22 010110 af23
26 011010 af31

HP 830 Series Specifications

General

Brand	HP
Model	830 Series
Category	Switch
Language	English