•For more information about 802.1p priority and DSCP values, see "Packet precedences."
•Local precedence is a locally significant precedence that the device assigns to a packet. A local precedence value corresponds to an output queue. Packets with the highest local precedence are processed preferentially.
The device provides the following priority trust modes on a port:
•Trust packet
•Trust port
You can select one priority trust mode as needed. Figure 462 shows the process of priority mapping on a device.
Figure 462 Priority mapping process
Introduction to priority mapping tables
The device provides the following types of priority mapping tables:
•CoS to
•DSCP to
Table 148 through Table 149 list the default priority mapping tables.
Table 148 Default CoS to Queue mapping table
Input CoS value | Local precedence (Queue) |
0 | 2 |
|
|
1 | 0 |
|
|
2 | 1 |
|
|
3 | 3 |
|
|
4 | 4 |
|
|
5 | 5 |
|
|
6 | 6 |
|
|
7 | 7 |
|
|
| 475 |