Re: [IPFIX] obsoleting obsoletion in 5102-bis and IE-DOCTORS
Paul Aitken <[email protected]>
| Newsgroups | gmane.ietf.ipfix |
|---|---|
| Message-ID | <[email protected]> |
Brian,
> On Aug 22, 2012, at 2:54 PM, Paul Aitken wrote:
>
>> Brian,
>>
>> No objection.
>>
>> Consider VRRP: although VRRP v2 (RFC 3768) was obsoleted by VRRP v3 (RFC 5798), v2 is still in common use.
>>
>> We should expect the same for IPFIX IEs: obsolete IEs may continue in use for many years because people are unaware, unable, or simply unwilling to update.
>>
>> Can IANA record the obsolescence date individually for each field?
> Yep. From IE-DOCTORS (current -04 working copy):
>
> The revision number of an Information Element is incremented upon deprecation, and the revision date updated.
Which revision date is that? The overall revision date of the registry?
>> Reviewing draft-ietf-ipfix-ie-doctors-03,
>>
>> The use of deprecated Information Elements SHOULD result
>> in a log entry or human-readable warning at the Exporting and
>> Collecting Processes.
>>
>>
>> That's just not possible. How can an existing EP know that its IEs have been deprecated? - Unless it's able to reference IANA, and method (1) of yesterday's discussion is in use.
> An EP using a deprecated IE sending to a CP using a deprecated IE has in essence no problem -- sure, they're deprecated, but they're interoperating ("living in the past") one could say.
>
> As soon as _one_ of them is updated, though, then one of them SHOULD log (within reason - once per IE per runtime should suffice, but this is an implementation detail).
>
> How about "the use of IEs known by a CP or an EP to be deprecated"...?
That would work.
Note that if the EP is to do this, then it knows that it's using a
deprecated IE, so it's part-way to answering Benoit's note/objection.
>> However, that's not desirable since it allows a third party (whoever causes the IANA deprecation) to cause warnings to appear in your tried and tested and perfectly good EP - CP setup.
> Which is the last remaining question on IE-DOCTORS, and the short version of the other thread: to remove ESIE Reference from IE-DOCTORS or not?
We need wider community input on this one.
P.
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