6. IANA Considerations

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 RECOMMENDED 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
1	xxxxx0	Standards Action
2	xxxx11	EXP/LU
3	xxxx01	EXP/LU (*)

(*) may be utilized for future Standards Action allocations as necessary

This document assigns eight RECOMMENDED codepoints ('xxx000') which are drawn from Pool 1 above. These codepoints MUST be mapped, not to specific PHBs, but to PHBs that meet "at least" the requirements set forth in Sec. 4.2.2.2 to provide a minimal level of backwards compatibility with IP Precedence as defined in [RFC791] and as deployed in some current equipment.