RE: [ippm] draft-shalunov-ippm-reporting-00.txt - availability

["Geib, Ruediger" <[e-mail]>]

Hi Al,

|Users experience network performance in at least two states:
|available or "broken" (unavailable) where typically some
|sort of failure or misconfiguration cannot be restored automatically
|and requires human intervention.
|
|The tricky part is defining the performance levels that
|constitute the transitions between the two states,
|and keep them application-independent for simplicity.

Exactly.

|Despite the difficulties, Availability is probably one of
|the most important network metrics, as far as real users
|are concerned.

Yes, it is part of many product descriptions and SLAs.

Regards, 

Rudiger

|At 08:39 AM 5/2/2006, Geib, Ruediger wrote:
|>Stas,
|>
|>Real time and leased line services are characterised by an 
|>"availability". I think availability is a useful and common 
|>means to characterise these services. Today, there's only a 
|>meausurement principle for IP service availability. There's 
|>no commonly implemented IP service availability measurement 
|>(RFC2678 on connectivity proposes some metrics which may be 
|>useful).
|>
|>The idea is that you define a service availability over time. If the 
|>service is available, the metrics you've listed below are applied to 
|>characterise the service. If the service is not available, 
|>then no further performance characterisation is required.
|>
|>As more real time services start to be migrated to the 
|>Internet, measuring IP transport availability may be of interest.
|>
|>Regards,
|>
|>Rudiger
|>
|>
|>Carsten|> * additionally "availability" could be one metric
|>|>   (probably with param = (list of) server(s) or network)
|>
|>Stas|Why aren't existing metrics enough?  When no packets
|>|come through, you'll see
|>|
|>|delay = +infinity
|>|loss = 100%
|>|jitter = undefined
|>|duplication = 0%
|>|reordering = 0%
|>|
|>|Is that not enough?
|>
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