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Weird 10Gbe networking problems (lemmy.world)

submitted 11 months ago* (last edited 11 months ago) by [email protected] to c/[email protected]

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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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[–] [email protected] 8 points 11 months ago* (last edited 11 months ago) (7 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.

[–] [email protected] 3 points 11 months ago (1 children)

I was thinking the same thing. Spanning tree is love. Spanning tree is life.....when deployed correctly.

Alternatively I'm thinking noise, as I've seen that in 10gig connections a few times, which is why I prefer LC fiber where possible.

[–] [email protected] 1 points 11 months ago

Oh yeah for sure, every time I’m like “it can’t be spanning tree” it is spanning tree. Do you mean copper vs fiber? LC connectors can carry a variety of speeds but generally yeah I try to use fiber or DAC cables which are shielded wherever I can.

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