Margaret Wasserman wrote:
> This seems a lot simpler than the current doc, and would allow
> routers to make some immediate use of the flow label field to
> limit situations where they need to parse into the packet to
> find upper-layer ports (parse once, and cache the value based
> on src/dst/flow label).
>
What you described above is equivalent to the "opportunistic" flow set-up mechanism
included originally in RFC 1883. The practice was abandoned already in RFC 2460.
Jarno
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