Enterasys Networks 6H3xx Betriebsanweisung

The IP TOS Rewrite feature enables you to configure the switch to:

Insert a user-defined 8-bit value into the layer-3 TOS field. 

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

The IP TOS Rewrite parameters are set using the Priority Classification screen. The screen enables 
you to configure the new IP TOS field for any IP frame classification. A selection field is displayed 
for all supported classification rules. The default value is “NO CHANGE”. You can optionally 
specify TOS=PID, whereby the precedence sub-field in the TOS field to match the value of the 
priority in the classification rule. You can also specify a CUSTOM TOS value between 0 and 255. 
This allows you to specify an IP TOS value for a particular need.

To see which ports are set to a particular PID/Classification (Classification Rule), the Protocol Port 
Configuration screen must be displayed. 

To access the Protocol Port Configuration, proceed as follows:

1. Use the arrow keys to step to the line with the Classification Rule of interest.

2. Press ENTER. The Protocol Port Configuration screen displays, showing a list of the current 

ports and those associated with the Classification Rule selected in 

. These ports are 

identified on the screen by a YES setting. For more information about the Protocol Port 
Configuration screen and how to use it, refer to 

.

To add a Classification Rule, proceed as follows:

1. Use the arrow keys to highlight the PID (priority identification) field.

2. Type in the appropriate priority (0 through 7), where 0 is the lowest priority and 7 is the highest 

priority. Press ENTER.

3. Use the arrow keys to highlight the Classification field.

NOTE: It is strongly recommended that you read 

 for more information 

concerning classification before configuring the switch module. Incorrect configuration 
will affect network operation.