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

Carlos,

The distribution of the poll will be relatively static, even if one node
is operating in saturation, the limited availability of labels will
cause problem for that node.

/Loa

On 2017-02-22 19:54, Carlos Jesús Bernardos Cano wrote:
> 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
>>
>>
>
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-- 

Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64