Re: [PCN] Architecture draft - probing section & general updates.

[Lars Eggert <[e-mail]>]

On 2007-10-25, at 13:56, ext [e-mail] wrote:
> Lars, I believe the guess is that there'll be many ingress-egress  
> pairs
> with none or very few flows at a particular moment. Not a random
> distribution of calls onto all possible pairs. Basically there are  
> many
> calls between London & Manchester and very few between truro and
> Shetland.

I can agree with that. But note that that alone is not a problem yet.

The problem occurs only when several of these "empty" ingress pairs  
share a bottleneck *and* when single flows start simultaneously  
sending across them at a combined rate that will push the bottleneck  
directly into overload.

I don't believe this can be very common. Wouldn't you provision your  
network such that interior routers could handle at least one flow per  
ingress/egress pair? In which case there is no issue unless there's a  
failure. And why not let flow termination handle these rare cases?

> I & Ben will try and extract some numbers from the [bt]
> predicted future traffic matrix.

That'd be *very* useful! We're all guessing probabilities here, and  
data would help.

Lars

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