Network Card User Manual

C ONFIGURING THE S WITCH
2-70
Mapping IP Precedence
The Type of Service (ToS) octet in the IPv4 header includes three
precedence bits defining eight priority levels ranging from highest priority
for network control packets to lowest priority for routine traffic. Bits 6 and
7 are used for network control, and the other bits for various application
types. The ToS bits are defined in the following table.
Fields and Attributes
• IP Precedence/DSCP Priority Status – Selects IP Precedence,
DSCP, or disables both priority services.
• IP Precedence Priority Table – Shows the IP Precedence to CoS
map.
• Class of Service Value – Maps a CoS value to the selected IP
Precedence value. Note that “0” represents low priority and “7”
represents high priority.
Priority Level Traffic Type
7 Network Control
6 Internetwork Control
5Critical
4 Flash Override
3Flash
2Immediate
1Priority
0 Routine