Re: [IPFIX] IPFIX observationPointId uniqueness

Hi Paul,

This seems like a good idea.

-Andrew

On 02/01/2013 04:45 AM, Paul Aitken wrote:
> Dear IPFIX experts,
>
> IPFIX observationPointId (#138) is defined as:
>
>          An identifier of an Observation Point that is unique per
>          Observation Domain.  It is RECOMMENDED that this identifier is
>          also unique per IPFIX Device.  Typically, this Information
>          Element is used for limiting the scope of other Information
>          Elements.
>
> We now also have observationPointType (#277), defined as:
>
>           Type of observation point. Values assigned to date are:
>
>           1. Physical port
>           2. Port channel
>           3. Vlan.
>
>
> Could we relax the uniqueness requirements of observationPointId when 
> an observationPointType is also exported, such that the { 
> observationPointType, observationPointId } pair must be unique, though 
> not the observationPointId itself.
>
> The reason being that observation points of different types already 
> have IDs, though these are not unique. eg, we have interface 1, 2, 3, 
> ...; vlan 1, 2, 3, ...; port 1, 2, 3, ...
>
> So an extra mediation layer is required to convert values from each of 
> these number spaces into unique IDs in the observationPointId number 
> space - which becomes harder as we add more places that observations 
> can be made, ie more observationPointTypes.
>
> Whereas prefixing with the observationPointType achieves the required 
> uniqueness in a faster, simpler, and more reliable way.
>
> To achieve this, I'd propose the following definition change:
>
>          An identifier of an Observation Point that is unique per
>          Observation Domain and per observationPointType, if specified.
>          It is RECOMMENDED that this identifier is
>          also unique per IPFIX Device.  Typically, this Information
>          Element is used for limiting the scope of other Information
>          Elements.
>
> For backwards compatibility, we could define observationPointType = 0 
> to be "unspecified".
>
> Thanks,
> P.
>
>
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