24-Port Fast Ethernet Switch Management Guide

C LASS OF S ERVICE C ONFIGURATION
3-211
Mapping DSCP Priority
The DSCP is six bits wide, allowing coding for up to 64 different
forwarding behaviors. The DSCP replaces the ToS bits, and it retains
backward compatibility with the three precedence bits so that non-DSCP
compliant, ToS-enabled devices, will not conflict with the DSCP mapping.
Based on network policies, different kinds of traffic can be marked for
different kinds of forwarding. The DSCP default values are defined in the
following table. Note that all the DSCP values that are not specified are
mapped to CoS value 0.
Console#show map ip precedence ethernet 1/5 4-267
Precedence mapping status: disabled
Port Precedence COS
--------- ---------- ---
Eth 1/ 5 0 0
Eth 1/ 5 1 0
Eth 1/ 5 2 2
Eth 1/ 5 3 3
Eth 1/ 5 4 4
Eth 1/ 5 5 5
Eth 1/ 5 6 6
Eth 1/ 5 7 7
Console#
Table 3-15 Mapping DSCP Priority
IP DSCP Value CoS Value
00
81
10, 12, 14, 16 2
18, 20, 22, 24 3
26, 28, 30, 32, 34, 36 4
38, 40, 42 5
48 6
46, 56 7