Re: RE : [ippm] comments on draft-ietf-ippm-reporting-mib-04.txt

On Thu, 4 Dec 2003, STEPHAN Emile FTRD/DAC/LAN wrote:

> Dear All,
>
> The IPPM MIB is designed as the reporting interface for a set of points of measure colocated (an embedded SNMP agent) or distributed (an IPPM proxy).
>
> The workflow of the reporting is simple:
>
>     test packet arrival
>          |
>          V
>     network metrics computation ----> ippmHistoryTable
> 	owd,ploss,ipdv...
>          |
>          V
>    Aggregated metrics computation --> ippmHistoryTable
>  	min,max,avgt,%... of owd,ploss,ipdv...
>          |
>          V
>      filtering ---------------------> ippmReportTable
>
>
> The aggregation permits to produce results over well known period of
> time (e.g.: every 5 minutes, per hour...). Reporting raw singletons have
> a big limitation: If you increase the test packets rate you increase the
> volume of information to report too. The aggregation permits to solve
> this scalability issue: The volume of information to report does not
> increase with the test packets rate.

This is true.  However:

1. People prefer different aggregation intervals, different numbers
   (average, median), for different applications.  It is impossible to
   predict everything anybody is ever going to ask for, let alone
   standardize it.

2. For a single, one time, measurement, the ippmHistoryTable have a
   limited size.  For continous measurements, ippmHistoryTAble can
   be implemented as a round robin, with the application above it
   responsible to read the buffer before data expires (or accept that
   data is expired).

> The IPPM MIB stores only network measure results:
>
>     test packet arrival
>          |
>          V
>     network metrics computation --> ippmHistoryTable
> 	owd,ploss,ipdv...

I'd go for this.

Henk  (Chair hat off)

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Henk Uijterwaal                             Email: henk.uijterwaal@ripe.net
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That problem that we weren't having yesterday, is it better? (Big ISP NOC)

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