Re: [IPFIX] enterprise ID 0

Gerhard Muenz <[email protected]> Wed, 12 Sep 2012 22:57:00 +0200
Newsgroups	gmane.ietf.ipfix
Message-ID	<[email protected]>
Hi,

An enterprise number parameter also appears in the IPFIX MIB (see 
ipfixTemplateDefinitionEnterpriseNumber):

        DESCRIPTION
            "IANA enterprise number of the authority defining the
            Information Element identifier in this Template Record.
            Enterprise numbers are assigned by IANA.  A current list of
            all assignments is available from
            <http://www.iana.org/assignments/enterprise-numbers/>.

            This object must be zero(0) for all standard Information
            Elements registered with IANA.  A current list of these
            elements is available from
            <http://www.iana.org/assignments/ipfix/>."

A zero value for this MIB parameter or for the enterprise number 
parameters appearing in IPFIX CONFIG does not imply that a zero 
enterprise number value appears in any IPFIX message.

I think it is clear that enterprise-specific IEs must have a non-zero 
enterprise number, and therefore there should not be a problem if data 
models take the forbidden zero value as an indicator for IANA-IEs.

Thanks,
Gerhard


On 06.09.2012 15:45, Paul Aitken wrote:
> Andrew,
>
>> As I understand the question we are only talking about the case where
>> the datatype and semantics are identical for IANA-IE and (IANA-IE &
>> 0x8000) and not some weird second IE space.
>
> That's a good point - there could be a second "parallel" IE space here.
> We could potentially use this in future if we ever get to 32k IANA elements.
>
>
>> I'm OK with Brian's suggestion of EP SHOULD NOT and CP MUST.  I also
>> think it is worth stating explicitly.
>
> So we define equivalence between the two?
>
>
>>    I'm pretty sure my CP will not currently accept IEs sent this way,
>> but that can be fixed easily enough.
>
> That's why I asked! :-)
>
>
> Thanks,
> P.
>
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