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How does Diffserv Codepoint work?

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Article ID: KB6292 KB Last Updated: 27 Aug 2010Version: 3.0
Summary:
How Does Diffserv Codepoint Work?
Symptoms:
Traffic Shaping RFC1349 How does Diffserv Codepoint work? How does the mapping of Traffic Priority Levels to TOS byte happen?
Solution:

This solution applies to ScreenOS 4.0.0 and higher:

 

NetScreen
settings
PDTRCU

Decimal/
Codepoint

HexNotes
High Priority11100000224e0According to RFC1349, routers use this setting for high priority
1st Priority11000000192c0
2nd Priority10100000160a0
3rd Priority1000000012880
4th Priority011000009660
5th Priority010000006440
6th Priority001000003220
Low Priority0000000000RFC 1349 Calls this normal service
RFC 2474 calls this default PHB (per hop behavior)

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