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[Cristina Klippel Dominicini <>]

Hi Csaba,

Thanks for the files and explanation!

We still have some doubts:
- In the config you provided, PAR0101 is a DPDK node and the others are all 
Tofino nodes?
- In the booking site (https://p4-bkd-srv.rare.nmaas.eu), we can only reserve 
the 4 Tofino nodes (FRA,AMS,BUD,POZ), which are accessed via ssh. What about 
the DPDK nodes? How to access them and where are their connection points in 
the topology?
- Regarding the dpdk freerouters, are they already configured and ready to 
use or we have to setup the virtual interfaces and other installation steps?
"you can always initiate a ping flood from these, or, the dpdk freerouters' 
linux could connect to the testbed if you add a veth pair, whose side1 is 
used by the linux to do the iperfing, and side2 is given to freerouter to 
handle the packets... (the famous eth20001 interface of the default 
freerouter installation to a vm, for example)"
- Regarding the traffic generator, we will start with ping and iperf, but 
then we will need something more powerful. We participated in the dev 
sessions when Carmem demonstrated TREX in her setup. Do you think we could 
reproduce that in the P4 lab?
- Does freeRtr support any way to balance the load through different tunnels 
(as in WCMP, weighted cost multiple paths)?
- If we want to access other nodes that are not currently in the booking site 
(e.g., CHI or GVA), how is it possible?

I don't know if you still are scheduling the freeRtr dev sessions on 
Tuesdays, but, if possible, it would be a good opportunity to discuss this 
experiment.

Best regards,
Cristina

________________________________________
De: mc36 <>
Enviado: segunda-feira, 9 de maio de 2022 13:55
Para: Cristina Klippel Dominicini; Frederic LOUI
Cc: Marcos Schwarz; Everson Scherrer Borges; Magnos Martinello; Rafael Silva 
Guimarães; 
Assunto: Re: Experiments PolKA vs. Segment Routing

hi,
i go inline....
br,
cs

On 5/9/22 18:38, Cristina Klippel Dominicini wrote:
>
> The main idea is to compare PolKA with Segment Routing in RARE, since both 
> are source routing approaches supported by freeRtr. Thus, the first (and 
> fundamental) question is: if you
> can collaborate with us to produce this experiment, and if you see this as 
> a nice showcase of RARE/freeRtr. Everson, Marcos, me and the rest of the 
> team will be responsible for
> producing the experiment, but we will for sure need your guidance and 
> knowledge to properly explore RARE/freeRtr.
>
yess!


>
> As an initial step towards the big plan, we want to reproduce the emulated 
> PolKA experiment AS IS in the P4 Lab, and we already have some initial 
> questions:
> 1) Is there any initial documentation on how to setup a basic experiment in 
> the RARE P4 Lab with freeRtr (access, instalation, ...)?
right now, the testbed is running rare in a mixed tofino & dpdk node 
environment...
attaching you the current configs plus the script to bring it up locally on 
your
pc in a similar way as everson does with his topology... as you can see in the
configs, both polka and sr are both up and running, the only thing yo need to
do is to add the tunnels and compare the results...

> 2) At the moment, the node configurations (port numbers, addresses) of the 
> emulated experiment is not resembling the real testbed. Is there any 
> documentation with this configuration?
as you can see in the script, the configs are archived at nmaas, accessible 
by eduid...
(in case you dont have access to it, also attaching the current config 
archive...)

> 3) In the emulated experiment, we have four core nodes (Frankfurt, 
> Amsterdam, Poznan and Budapest) running PolKA core and two edges that setup 
> the tunnels. For an experiment in the
> physical setup, do you have any advice on how to design the edge nodes? In 
> the first version of the experiment, should we use P4 nodes only for the 
> core and DTNs as edges with
> freeRtr? How do you normally setup edges in your experiments? It is not 
> clear for us at the moment how exactly to deploy edge freeRtr nodes in the 
> P4 Lab.
so the lab have 4 tofino switches, and 2 dtn nodes running freerouters...
you can always initiate a ping flood from these, or, the dpdk freerouters'
linux could connect to the testbed if you add a veth pair, whose side1 is
used by the linux to do the iperfing, and side2 is given to freerouter to
handle the packets... (the famous eth20001 interface of the default
freerouter installation to a vm, for example)

> 4) How do you currently generate traffic in the P4 Lab?
>
ping flood from the dtns usually enough for me.... :)

> If possible, it would be very nice if we could schedule some hands-on 
> sessions (as in the freeRtr dev meetings) to discuss and test this 
> experiment with you.
good idea... then it could be the topic for today...

________________________________

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