>>>>> On Mon, 30 Apr 2001 11:30:25 -0700, 
>>>>> "Richard Draves" <[EMAIL PROTECTED]> said:

>> I don't know, but if this (i.e. a "black-hole" preference) is 
>> the only possibility, why don't you just define it in the 
>> (next revision of) the draft?  It would ensure the best 
>> (future) interoperability.

> Because defining and implementing it properly is complicated, and it's
> not clear if it's worth the trouble.

Then I'd suggest to add the following logic to the draft.

  a host should treat an RA with the reserved preference as if it has
  the 0 router lifetime field, because the only known possibility of
  the usage of the reserved value is a "black-hole" preference.  but
  the current draft does not specify the semantics, because ... (your
  rationale).  To insure future interoperability, the reserved value
  should not be used with other semantics than a kind of the
  "black-hole" preference.

                                        JINMEI, Tatuya
                                        Communication Platform Lab.
                                        Corporate R&D Center, Toshiba Corp.
                                        [EMAIL PROTECTED]
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