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Re: IPComp rfc2393bis-00




>>>>	0-63 define well-known compression algorithms, which require no
>>>>	additional information, and are used for manual setup.  The
>There is a second use - to save the CPU cycles of the 
>CPI-to-algorithm conversion, even when the algorithm is negotiated
>dynamically. That is the rationale for the note in the CPI definition:
>   Compression Parameter Index (CPI)
>
>        16-bit index.  The CPI is stored in network order.  The values
>        0-63 define well-known compression algorithms, which require no
>        additional information, and are used for manual setup.  [...] Note: When
>        negotiating one of the well-known algorithms, the nodes MAY
>        select a CPI in the pre-defined range 0-63.  

	BTW If you use this optimization, the negotiated IPComp association
	will never get expired if it uses bytecount as expiration signal.

itojun




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