2-11
Figure 2-10 Priority mapping process
Introduction to Priority Mapping Tables
The device provides various types of priority mapping table, as listed below:
z CoS to DSCP: 802.1p-precedence-to-DSCP mapping table.
z CoS to Queue: 802.1p-precedence-to-local-precedence mapping table.
z DSCP to CoS: DSCP-to-802.1p-precedence mapping table, which is applicable to only IP packets.
z DSCP to DSCP: DSCP-to-DSCP mapping table, which is applicable to only IP packets.
z DSCP to Queue: DSCP-to-local-precedence mapping table, which is applicable to only IP packets.
Table 2-4 through Table 2-5 list the default priority mapping tables.
Table 2-4 The default CoS to DSCP/CoS to Queue mapping table
Input CoS value Local precedence (Queue) DSCP
0 2 0
1 0 8
2 1 16
3 3 24
4 4 32
5 5 40
6 6 48
7 7 56
Table 2-5 The default DSCP to CoS/DSCP to Queue mapping table
Input DSCP value Local precedence (Queue) CoS
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
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