NETGEAR is aware of a growing number of phone and online scams. To learn how to stay safe click here.
Forum Discussion
Solved
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.
Hello webernetz
And welcome to the NETGEAR Community! 🙂
Looks like your firmware is not updated. You may want to try updating the firmware to the latest and see if there will be any difference. If the issue is the same after the update of firmware you could try opening a ticket with our support team.
Have a lovely day,
Erwin
Netgear Team
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.
Wow, thanks for that, Kurt! This was it! I just changed the speed on the ports to "speed 1000 full-duplex". And now, even after a reboot, those ports come up again. Nice. Thanks a lot!
(There are only 1G SFPs installed. Hence I don't understand why this problems arose at all. The ports are capable of SFP+ modules though.)
Grüße aus Deutschland. 😉
Johannes
One more thing to note:
I was using the "speed 1000 full-duplex" configuration command on several ports. While this config stayed the same on normal ports, it turned into a "no auto-negotiate" on port-channel "lag" ports. I've no idea, why...?!?
NETGEAR Academy
Boost your skills with the Netgear Academy - Get trained, certified and stay ahead with the latest Netgear technology!
Join Us!
