HP 1920-24G-PoE+ Manual do Utilizador descarregar pdf (Página 488)

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• 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 priority—The device assigns to the packet the priority parameters corresponding to the

packet's priority from the mapping table.

• Trust port priority—The device assigns a priority to a packet by mapping the priority of the

receiving port.

You can select one priority trust mode as needed. Figure 462 sh

ows 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 Queue—802.1p--to-local mapping table.

• DSCP to Queue—DSCP-to-local mapping table, which applies to only IP packets.

Table 148 thr

ough Table 149 list the default priority mapping tables.

Table 148 Default CoS to Queue mapping table

ut CoS value Local

recedence (Queue)

0 2

1 0

2 1

3 3

4 4

5 5

6 6

7 7

1 2 ... 483 484 485 486 487 488 489 490 491 492 493 ... 546 547

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