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This IP TOS Rewrite feature enables a Network Administrator to assign Layer 3 TOS
characteristics to incoming frames and set the switch to rewrite the 8-bit TOS value in the Layer 3
information portion of incoming frames.
The SmartSwitch/Matrix 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.
The IP TOS Rewrite parameters are set using the Priority Classification Local Management
screen. The screen has been updated to allow 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.
2.0
PRIORITY CLASSIFICATION CONFIGURATION SCREEN
When to Use
To perform the following functions:
•
Display the current Priority, Classification, and Description entries of each classification rule.
•
Assign priorities according to Classification Rules.
•
Add/delete a priority and associated protocol entry.
•
Access the Protocol Port Configuration screen.
•
Assign an 8-bit TOS (also known as DF) value to incoming IP frames.
•
Write over an existing TOS value.
When a frame is received that already contains an 802.1Q frame tag, frame classification is not
implemented. Instead, the frame is processed by the SmartSwitch according to the information
contained in the 802.1Q frame tag.
How to Access
Use the arrow keys to highlight the PRIORITY CLASSIFICATION CONFIGURATION menu
item in the 802.1p Configuration Menu screen and press ENTER. The Priority Classification
Configuration screen,
2
Figure
2, displays.
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