Appendix C Introduction To Packet Precedences; Ip Precedence And Dscp Values - 3Com 4500G Family Configuration Manual

Input priority value
2
3
4
5
6
7
Table 10-3 The default dscp-lp, dscp-dp, dscp-dot1p, and dscp-exp priority mapping tables
Input priority value
DSCP
0 to 7
8 to 15
16 to 23
24 to 31
32 to 39
40 to 47
48 to 55
56 to 63

Appendix C Introduction to Packet Precedences

IP Precedence and DSCP Values

Figure 10-1 ToS and DS fields
As shown in Figure
represent IP precedence from 0 to 7. According to RFC 2474, the ToS field of the IP header is redefined
as the differentiated services (DS) field, where a 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.
dot1p-lp mapping
1
3
4
5
6
7
dscp-dp mapping
Drop precedence (dp)
0
0
0
0
0
0
0
0
10-1, the ToS field of the IP header contains eight bits, and the first three bits (0 to 2)
10-3
dot1p-dp mapping
0
0
0
0
0
0
dscp-dot1p mapping
802.1p priority (dot1p)
0
1
2
3
4
5
6
7