304 CHAPTER 28: QOS CONFIGURATION
You can also configure to trust packet priority. In this case, a received packet is
processed in one of the following three ways:
■ With the 802.1p precedence of a packet trusted, the switch obtains the
corresponding local precedence by looking up the 802.1p precedence of the
packet in the 802.1p-precedence-to-local-precedence mapping table and
assigns the local precedence to the packet.
■ With the DSCP precedence trusted, the switch obtains the corresponding local
precedence by looking up the DSCP precedence of the packet in the
DSCP-precedence-to-local-precedence mapping table and assigns the local
precedence to the packet.
■ With the IP precedence trusted, the switch obtains the corresponding local
precedence by looking up the IP precedence of the packet in the
IP-precedence-to-local-precedence mapping table and assigns the local
precedence to the packet.
The Switch 4210 provide COS-precedence-to-local-precedence,
DSCP-precedence-to-local-precedence and IP-precedence-to-local-precedence
mapping tables for priority mapping. Table 1-4 through Table 1-6 list the default
settings of these tables.
Tabl e 223 COS-precedence-to-local-precedence mapping table
COS
Local
precedence
0 1
1 0
2 0
3 1
4 2
5 2
6 3
7 3
Tabl e 224 DSCP-precedence-to-local-precedence mapping table
DSCP
Local
precedence
0 to 15 0
16 to 31 1
32 to 47 2
48 to 63 3
Tabl e 225 IP-precedence-to-local-precedence mapping table
IP precedence Local precedence
0 1
1 0
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