I have created a standard vSwitch with 4 VMs attached and 7 uplinks.
The address space on the switch contains mostly 10.10... and 192.168...
The uplinks connect to individual physical systems and one switch, but after initial success with connections, I find I can't ping systems that I could reach before.
I have updated the BIOS, iDRAC (it's a Dell XR12) and the networking firmware, but that had no affect
Any thoughts on what might be the issue?
do I got you right that most pNICs are directly attached to other pNICs and only a few are attached to a LAN switch?
If my assumption is correct you need to make sure that the portgroups you created only uses that pNIC as active which would allow the system to reach its counterparts, so no standby or multiple active pNICs.
I would also recommend to deactivate auto sense at both ends on those pNICs which are attached to other pNICs.
And of course make sure to use same speed and duplex settings.
Additionally you should also check if some of your equipment use some kind of power savings.
Do the behavior differ between cross connected devices vs those which are attached via your physical LAN switch?
Troubleshooting loss of connectivity in a multi-VM environment with a vSwitch can be tricky. A few things I would check:
It's puzzling you lost existing connectivity, so I would thoroughly review configs and logs to find where the change occurred. Let me know if the VMs regain connectivity or if you need any other troubleshooting tips!