3com 2928 Betriebsanweisung
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.
through
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
2 1 16
3 3 24
4 4 32
5 5 40
6 6 48
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