Sunfire B1600 manual Mapping IP Precedence, MIB Variables Associated With Traffic Prioritisation

To disable layer 3/4 traffic prioritization completely, use the following commands:

Console(config)#no map ip precedence

Console(config)#no map ip dscp

MIB Variables Associated With Traffic Prioritisation

TABLE 3-26MIB Variables Associated With Traffic Prioritization

Field Name	MIB Variable	Access	Value Range	Default Value
IP Precedence/	sun...	Read/write	disabled (1),	disabled
DSCP Status	priorityMgt.		precedence (2),
	prioIpPrecDscpStatus		dscp (3)

3.3.5.5Mapping IP Precedence

The Type of Service (ToS) octet in the IPv4 header includes three precedence bits defining eight different priority levels ranging from highest priority for network control packets to lowest priority for routine traffic. The default IP Precedence values are mapped one-to-one to Class of Service values (Precedence value 0 maps to COS value 0, and so forth). Bits 6 and 7 are used for network control, and the other bits for various application types. ToS bits are defined in the following table:

TABLE 3-27ToS Octet Traffic Types

Priority Level	Traffic Type
7	Network Control
6	Internetwork Control
5	Critical
4	Flash Override
3	Flash
2	Immediate
1	Priority
0	Routine

When mapping IP Precedence values to COS values through the web interface or CLI, the following parameters can be configured:

■IP Precedence – The current IP Precedence to COS map.

Chapter 3 General Management of the Switch 3-87