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Differentiated Services Field Codepoints (from RFC 2474)
The DSCP field within the DS field is capable of conveying 64 distinct
codepoints. The codepoint space is divided into three pools for the
purpose of codepoint assignment and management: a pool of 32
codepoints (Pool 1) to be assigned by Standards Action as defined in
[CONS], a pool of 16 codepoints (Pool 2) to be reserved for
experimental or Local Use (EXP/LU) as defined in [CONS], and a pool of
16 codepoints (Pool 3) which are initially available for experimental
or local use, but which should be preferentially utilized for
standardized assignments if Pool 1 is ever exhausted. The pools are
defined in the following table (where 'x' refers to either '0' or
'1'):
Pool Codepoint space Assignment Policy Reference
---- --------------- ----------------- ---------
1 xxxxx0 Standards Action [RFC2474]
2 xxxx11 EXP/LU [RFC2474]
3 xxxx01 EXP/LU (*) [RFC2474]
Pool 1 Codepoints (Guidelines from RFC2474)
Name Space Reference
---- ----- ---------
CS0 000000 [RFC2474]
CS1 001000 [RFC2474]
CS2 010000 [RFC2474]
CS3 011000 [RFC2474]
CS4 100000 [RFC2474]
CS5 101000 [RFC2474]
CS6 110000 [RFC2474]
CS7 111000 [RFC2474]
AF11 001010 [RFC2597]
AF12 001100 [RFC2597]
AF13 001110 [RFC2597]
AF21 010010 [RFC2597]
AF22 010100 [RFC2597]
AF23 010110 [RFC2597]
AF31 011010 [RFC2597]
AF32 011100 [RFC2597]
AF33 011110 [RFC2597]
AF41 100010 [RFC2597]
AF42 100100 [RFC2597]
AF43 100110 [RFC2597]
EF PHB 101110 [RFC2598]
References
[RFC2474] Nichols, K., et. al., "Definition of the Differentiated
Services Field (DS Field) in the IPv4 and IPv6 Headers", RFC
2474, December 1998.
[RFC2597] Heinanen, J., et. al., "Assured Forwarding PHB Group", RFC
2597, June 1999.
[RFC2598] Jacobson, V., et. al., "An Expedited Forwarding PHB", RFC
2598, June 1999.
(last updated May 09 2001)
[]
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