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Priority Classification Configuration Screen
6.7.2
About the IP Rewrite Function
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 packet and used by a device to indicate the precedence or
priority of a given frame (see
signal the frame priority from end to end as the frame makes its way through the network.
Figure 6-8 Datagram, Layer 2 and Layer 3
This IP TOS Rewrite feature enables a Network Administrator to assign Layer 3 TOS
characteristics to incoming frames and setting the switch to rewrite the 8-bit TOS value in the
Layer 3 information portion of incoming frames.
The SmartSwitch products enable 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.
6.7.3
Displaying the Current PID/Classification Assignments
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 screen, 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
identified on the screen by a YES setting. For more information about the Protocol Port
Configuration screen and how to use it, refer to
6-36
802.1 Configuration Menu Screens
Figure
6-8). The TOS layer-3 priority indicator enables the ability to
step
Section
6.8.
1. These ports are
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