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Question
How to convert IPP value to DSCP or TOS?
We have the ability within our phone system and ethernet switches (HP) to configure QOS based upon DSCP or TOS. However, we're configuring new circuits from Qwest, and they want us to select a qos option based upon IPP. I know that DSCP is the six most significant bits of the ToS byte, and IPP is the three most significant bits; so if I'm looking at this correctly, my default DSCP value of 184 will properly translate to an IPP of 5. Is this correct?
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by: FrabblePosted on 2007-01-26 at 21:59:32ID: 18409146
You're right.
But the DSCP is the most six significant bits, so the DSCP value of binary 101110 is decimal 46. This is the recommended codepoint for marking traffic for Expedited Forwarding, like voice.
As you can see from the bit pattern, the 3 most significant bits give you 5 for the IP Precedence.