Rare project developers

[Tim Chown <>]

> On 25 Aug 2022, at 15:00, Frédéric LOUI <> wrote:
> 
> Hi Time,
> 
> 1- No need multicast support from Lola, just stream ump final stream to 
> RARE/freeRtr into GP4L node
> 2- Even better, configure the Windows app to stream directly to unicast to 
> unicast translator
> 
> 3- My interest was more in whether we can gather latency and jitter 
> measurement data using Timemap on the GP4L; that can be useful both for 
> validating the TimeMap model but also supporting any real-time applications 
> we might run.
> 
> 3- can also be done as well. From my perspective this should not be that 
> hard to fill Influxdb or Prometheus
>    -> the only point is to make sure we export a KPI that already there or 
> easy to make it available via freeRtr’s sensor mechanics 

I’ve not seen Fabio or Claudio reply as yet.  We need them interested, or 
there’s no point in doing it.

> For -3- we are obviously here willing to help (but also for -1- and -2- :) 
> ) 

Tim

> 
> Cheers
> Frederic
> 
>> Le 25 août 2022 à 15:44, Tim Chown <> a écrit :
>> 
>> Hi Frederic,
>> 
>> It’s an interesting idea, but there are I think some challenges to it, 
>> including:
>> 
>> 1. There is no multicast support in LoLa (sender or receiver), or at least 
>> the word does not appear in the manual - 
>> https://lola.conts.it/downloads/Lola_Manual_2.0.0_rev_001.pdf.
>> 2. It is a Windows-only application, and while it is free to R&E users 
>> there is no source code to inspect.  The playback is non standard, just 
>> some form of UDP encoding, no use of RTP.  I don’t think for example VLC 
>> would be able to play it.
>> 
>> My interest was more in whether we can gather latency and jitter 
>> measurement data using Timemap on the GP4L; that can be useful both for 
>> validating the TimeMap model but also supporting any real-time 
>> applications we might run.
>> 
>> Tim
>> 
>>> On 25 Aug 2022, at 12:13, Frédéric LOUI <> wrote:
>>> 
>>> Thanks Tim for your explanation.
>>> 
>>> I’m not super familiar with Lola but do you think that would be a 
>>> relevant demo show casing:
>>> 
>>> - Lola streaming UDP to RARE/freeRtr unicat -> multicast translator
>>> - inject this stream into GP4L BIER multicast network
>>> - An a JunoS AMT relay in GP4L show casing interoperability
>>> - we can still have native multicast reception in GP4L (my homenet is 
>>> configured for that for example ...)
>>> - we also can have the multicast menu updated automatically so people can 
>>> see when a Lola streaming is effective
>>> 
>>> FYI the stream can be any where in Europe, we can receive can this 
>>> multicast stream via BIER all the way to CALTECH’s TOFINO2 starting from 
>>> today  ;)
>>> 
>>> Then this stream can be monitored in real time via Timemap fed with GP4L 
>>> either via streaming telemetry or prometheus
>>> 
>>> Please let me know your (or anyone’s) thoughts
>>> 
>>> All the best
>>> Frederic
>>> 
>>>> Le 25 août 2022 à 11:57, Tim Chown <> a écrit :
>>>> 
>>>>> On 25 Aug 2022, at 10:41, mc36 <> wrote:
>>>>> 
>>>>> On 8/25/22 11:34, mc36 wrote:
>>>>>> then 2 constant rsvp tunnels and that's it...
>>>>> 
>>>>> first you must nat the unicast to multicast... rare and cat6500 both 
>>>>> can do that in hardware... :)
>>>>> then you static joingroup the resulting stream to the 2 tunnel-te s
>>>>> and that's all... you have 2 constant streams, one copy should reach 
>>>>> the tunnel destination...
>>>>> if not, you can have more constant streams... no need to do a thing in 
>>>>> the core if there are some bandwidth...
>>>>> 
>>>>> so which netmusic.... the distributed musicinas (lola?:) project you 
>>>>> mentioned yesterday…
>>>> 
>>>> Aaaah! :)
>>>> 
>>>> So that type of distributed music performance uses platforms like LoLa, 
>>>> which is a project led by GARR in Italy - https://lola.conts.it/, and 
>>>> the work in WP6T1 on LoLa is really about measuring latency and jitter 
>>>> to help troubleshoot networks when the distributed musicians get poor 
>>>> quality of experience.  That’s what’s led to the TimeMap platform that 
>>>> gives a view of the latency and jitter per hop on the GEANT backbone.
>>>> 
>>>> LoLa, the software, I think is Windows only, and you run it on very well 
>>>> tuned hardware (as encoding and decoding adds latency, maybe more than 
>>>> the network).  It doesn’t use RTP, just raw UDP, as far as I know.
>>>> 
>>>> There’s a map of known LoLa users here, seems to be one in Budapest too! 
>>>>  
>>>> https://www.google.com/maps/d/u/0/viewer?mid=1RUFFnVkuPnXnBPWThnUlMp96_Co&hl=it&ll=-3.81666561775622e-14%2C-82.15722249999999&z=1
>>>> 
>>>> The interesting thing is then whether TimeMap can be easily applied to 
>>>> the GEABT P4 Lab network.  It seems it can.  There are of course other 
>>>> tools you could use, but validating TimeMap on our P4 Lab would be 
>>>> useful, if it’s not a lot of effort.  It all seems compatible with 
>>>> Telegraf export to influxdb. 
>>>> 
>>>> Tim
>>>> 
>>> 
>> 
>