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Weird 10Gbe networking problems (lemmy.world)

submitted 11 months ago* (last edited 11 months ago) by tmjaea@lemmy.world to c/selfhosted@lemmy.world

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Hi,

I've got a network setup consisting of 3 proxmox servers of which two have a 10Gbe interface. All interfaces are RJ45 copper ports.

So far I've got two qnap switches with 2 10Gbe and 5 2.5Gbe portss. They are connected to each other via one of the 10Gbe ports, and one of the servers on the other one.

This setup is working flawlessly, iperf measurements show 9.4gbit/s in both directions.

Recently I tried to increase my network for future expansion and bought a trendnet switch with 5 10Gbe ports.

Weird problems occurred and as they were also described in some amazon reviews I returned the switch and bought another one, this time a 4port 10Gbe switch from ubiquity.

Again there are problems. This time one direction seems to be at 10gbit/s as expected while the other direction (between the same two servers) is limited to 1gbit/s. The connection to the third server shows the same problem (one direction 2.5gbit/s and the other one limited to 1gbit/s).

All wires are connected correctly and as there is no problem on the qnap switches I do believe that there is no hardware problem on the cable/NIC side.

However I'm not sure if this is this just bad luck or some deep network problem I don't understand.

Maybe someone has an idea?

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[–] bigredgiraffe@lemmy.world 8 points 11 months ago* (last edited 11 months ago) (5 children)

Can you draw a picture of how you have all 3 switches connected with all of the wires? I am suspicious that you are creating a switching loop or spanning tree isn’t picking the optimal link on accident so I’m curious.

[–] tmjaea@lemmy.world 1 points 11 months ago (2 children)

It's just two switches.

Server 1

10Gbe

ubiquity switch

10Gbe

qnap switch

10Gbe

server 2.

[–] perslue@lemmy.ca 1 points 11 months ago

I'll ask some basics:

Is the ubiquity switch the flex-xg? Make sure you're using the 10G ports as the poe port is only 1G.

I'm assuming all the ethernet cables are rated for 10G?

Are any of the switches or NICs manually configured to negotiate at a lower transmit rate?

That's all I've got, good luck.

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