Enterasys Networks 1G58x-09 사용자 설명서

The Type of Service (ToS) field [also known as the Differential Services (DF) field in RFC 2474] 
is an 8-bit field. It is located in the IP header and used by a device to indicate the precedence or 
priority of a given frame (see 

). Together with the 802.1p priotity and IP, ToS fields enable 

the ability to signal the frame priority from end to end as the frame makes its way through the 
network. The set priority classification tosvalue command enables you to set the value for the 
precedence or priority of a frame at both Layer 2 and Layer 3.

This IP ToS rewrite feature enables a Network Administrator to assign both Layer 2 Class of 
Service (CoS0 and Layer 3 ToS characteristics to incoming frames by rewriting the 8-bit ToS value 
in the IP header of incoming frames.

The Matrix E1 products enable you to configure the device to:

Insert a user-defined 8-bit value into the IP ToS field. 

Overwrite an existing ToS value. This is useful when the Network Administrator wants to 
enforce a specific priority policy in the network.

Use this command to enter the ToS value. This value identifies to the various switch devices and 
routers in the IP-based network those packets which should have preferential treatment on a Class 
of Service (CoS) basis.

set priority classification tosvalue tos_value priority_value data_meaning 
data_value [data_mask]

Destination

Address

(DA)

Source

Address

(SA)

VLAN

Priority

Type of

Service

(8-bits)

3559_2

Layer 2

Header

Length

Version

VLAN

Priority

Type of

Service

(8-bits)

Layer 3 - IP Packet