Re: [IPFIX] IPFIX observationPointId uniqueness

hi Paul,

Sounds reasonable to me.

Cheers,

Brian

On 1 Feb 2013, at 10:45 , 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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