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

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

Hi Loa,

On Wed, 2017-02-22 at 19:46 +0800, Loa Andersson wrote:
> Yes,  it is true that it is rough, but normally I want a scaling
> factor
> of at least 10 (or more).

Sure, fully agree. But you can also assume that all edge network nodes
will not be operating in saturation mode all the time, no?

Carlos
 
> 
> /Loa
> 
> On 2017-02-22 19:41, Carlos Jesús Bernardos Cano wrote:
> > 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
> 
>