Re: [Detnet-dp-dt] an attempt on math for global pools of labels

[Carlos Jesús Bernardos Cano <[e-mail]>]

Hi Loa,

I agree it is worth doing this kind of rough estimate. I guess we need
also some insights from use cases to do a better estimate. 

On Wed, 2017-02-22 at 18:59 +0800, Loa Andersson wrote:
> Folks,
> 
> Figures are not scientific, just off the top of my head.
> 
> Assume that we have 400 edge nodes and the receiving and sending
> capability of each node is 2400 G and the average DetNet flow is 1G,
> and the traffic matrix is close to even.
> 
> This means that each node will need 2400 Labels to manage as a pool
> for
> the d-pw labels if we go with the idea to make them unique for the
> entire domain. 400 * 2400 = 960 000 which brings us close to
> exhausting 
> the label space.

So you assume that all edge nodes are saturated, right? Is this a
reasonable assumption? I have some doubts, but this is just a personal
feeling.

And, what do we assume of the inner topology/nodes capacities? because
unless the topology is really meshed, that number of flows would
generate an aggregated throughput (especially considering that some
nodes will be doing replication of packets) in some nodes that is
probably higher than what the links can support, no?

Thanks,

Carlos

> 
> I real life I don't think that the average speed is as high as 1G, if
> it
> were "only" 500 M, the label space would be exhausted.
> 
> /Loa