Hello,
I have a question / problem about SFP+ port flapping.
I would like to create a 10G link between a CRS328-24P-4S+ and a CRS312-4C+8XG.
Until now, we used it so that the CRS328 had an S+RJ10 module, and this was connected to the CRS312 with a plain copper cat6a cable (it did not use an SFP+ module, since it has 10G ethernet ports by default). We had a stable link all the time.
We decided to switch to optics, both switches had a Huawei OSX040N03 module (Mikrotik recognizes it as Hisense LTF8502-BC+), I turned off auto negotiation and the 10G link is set up nicely. However, approx. Every 1-2 hours, the CRS312 starts flapping (LINK DOWN then LINK UP in a few tenths of a second, and the connection is reestablished for a few hours). However, when the 312 is disconnected, there is no flapping on the 328 (it shows that the connection is stable throughout, so for example, in one day the 312 had 10-15 link downs, while the 328 had zero link downs). On the one hand, I don’t understand this, because if the connection is disconnected on one side for a while, then the other side should also link down, right?
I tried to replace the two modules, in case one of them is faulty, but even after the replacement, the 312 flapped.
I checked the cable, it’s fine, the Tx Power and Rx Power are fine, the modules don’t get hot, so I don’t understand what the problem could be.
I might also suspect that the 312 doesn’t like the Huawei module, but then why does it only disconnect once every 1-2 hours and not continuously?
I’m also thinking about putting a factory S+85DLC03D or XS+85LC01D module in the 312 (or both) (I don’t know which one would be better, they’re the same price), but I’m a little afraid that it will do the same thing to them, and I wouldn’t want to buy new modules just for testing unnecessarily.
So I don’t know which direction to go to find out the error.
Thanks in advance.