Yesterday I upgraded the firmware of several switches to R.10.7.0 and ran into several odd issues.
The setup is the following:
A (NV1534 2nd Gen) <-> 2.5GB fiber <-> B (NV1534 2nd Gen)
B is connected via two port-channel connections (2xCat5e each channel) to C (NV1524) and D (NV1544).
D is connected to E (NV1224ST) via port-channel (2x Cat5e).
I updated the firmware on A, B and D yesterday to R.10.7.0 because D was a new switch we installed yesterday and the NV1534 were still running 18.03.01.00 so I thought updating the firmware would be a good idea.
After the update odd things started to happen - the port-channel to C would show as working but I could not ping C nor could I access the web-interface of C anymore but that worked when I unplugged one of the two Cat5 cables.
The other odd thing that happened was ping times to A and B (while connected with a PC to A) were jumping from 120ms to 390ms with every third packet being dropped. The whole network throughput was rather unbearable.
We have about 50 computers on the network and 2 VLANs - one office VLAN for all computers and servers, one iSCSI VLAN for a NAS device and two Hyper-V servers - these VLAN's are only on A and B where these devices are connected to.
I ended up rolling back the firmware on A and B to 18.03.01.00 and everything went back to normal.
Any idea what the problem is? I made sure that I downloaded the correct firmware for A and B - 2nd generation, the new firmware seems to work fine on the NV1544.
Could it be a performance issue with the firmware being more demanding on the hardware? Does the 1544 have a faster CPU and should I perhaps use that one for the iSCSI and the Hyper-V servers?
On another note - I also updated the firmware on a Netvanta 7100 a week ago and after the update my Windows 8 laptop would no longer be able to access the Internet though it. It was working fine with the previous firmware - but after the update packets coming from my Windows 8 laptop would be blocked by the firewall. The Windows 7 and Windows XP machines didn't have any issues. Even an iPhone and a Windows 8 mobile phone was working fine.
Any input would be appreciated.