H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 61)

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Table 5 Default dscp-lp, dscp-dp, dscp-dot1p, and dscp-exp priority mapping tables
Input priority value dscp-lp mapping dscp-dot1p mapping
DSCP Local precedence (lp) 802.1p priority (dot1p)
0 to 7 0 0
8 to 15 1 1
16 to 23 2 2
24 to 31 3 3
32 to 39 4 4
40 to 47 5 5
48 to 55 6 6
56 to 63 7 7
Appendix B Introduction to packet precedences
IP precedence and DSCP values
Figure 17 ToS and DS fields
As shown in Figure 17 , the ToS field in the IP header contains eight bits. The first three bits (0 to 2)
represent IP precedence from 0 to 7. According to RFC 2474, the ToS field 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.
Table 6 Description on IP precedence
IP precedence (decimal) IP precedence (binary) Description
0 000 Routine
1 001 priority
2 010 immediate
3 011 flash
4 100 flash-override
5 101 critical