3Com 4210 PWR Configuration Manual page 306

304 C 28: Q S C
HAPTER O ONFIGURATION
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.
Table 223 COS-precedence-to-local-precedence mapping table
COS
0
1
2
3
4
5
6
7
Table 224 DSCP-precedence-to-local-precedence mapping table
DSCP
0 to 15
16 to 31
32 to 47
48 to 63
Table 225 IP-precedence-to-local-precedence mapping table
IP precedence
0
1
Local
precedence
1
0
0
1
2
2
3
3
Local
precedence
0
1
2
3
Local precedence
1
0