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M4300 switch: port is down after reboot
Hello community. I'm facing the following issue: I have 3x M4300 switches in a circle. After rebooting (reload) one of the switches, some of those ports connecting to the other 2x switches are do...
Hallo Johannes,
A little bit thin insights to provide an answer and discuss in the community.
In case there are 10G/1G SFP+ modules plugged, it's extremely likely these try to establish a 10G link - what might be not reliable when connecting to a DWDM port operating only on 1000M, since there is (different from copper Ethernet) no link negotiation. Suspect more a "random" effect of the "down" and "up".
Strongly recommend to use the appropriate SFP+ module (a pure SFP 1000BASE-FX for this fiber link) , and not to depend on some "auto"magic.
I'd suggest to get in contact with the Netgear ProAVDesign team (with LaurentMa at the helm), refer to this thread please, and chime back on the findings. This team is much nearer to the engineering than the community moderators or other "old crows" like me here.
Grüsse aus der Schweiz,
-Kurt.
Hey Erwin. Thanks for your answer. In the meantime I upgraded all switches to the most current version (12.0.19.7), but the issue remains.
We suspect the DWDM system between the data centres, or at least some kind of interaction between the SFPs. Do you have any known issues with such systems?
Hallo Johannes,
A little bit thin insights to provide an answer and discuss in the community.
In case there are 10G/1G SFP+ modules plugged, it's extremely likely these try to establish a 10G link - what might be not reliable when connecting to a DWDM port operating only on 1000M, since there is (different from copper Ethernet) no link negotiation. Suspect more a "random" effect of the "down" and "up".
Strongly recommend to use the appropriate SFP+ module (a pure SFP 1000BASE-FX for this fiber link) , and not to depend on some "auto"magic.
I'd suggest to get in contact with the Netgear ProAVDesign team (with LaurentMa at the helm), refer to this thread please, and chime back on the findings. This team is much nearer to the engineering than the community moderators or other "old crows" like me here.
Grüsse aus der Schweiz,
-Kurt.
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