I have a really odd problem:
I have an SG300 with a few VLANS and hosts plugged into them.
the issue I have is:
I have 2 ports set up as a LAG with a HP NAS attached to it, all other hosts except for 1 can communicate with the NAS
all the hosts, NAS, LAG etc are on the same VLAN (VLAN10)
when i unplug one of the cables on the LAG, the problem host can then communicate with the NAS, as soon as i plug it back in again it stops again. it doesn't matter which calbe i unplug, either will get it working
The same NAS was plugged into a 2960 earlier with a LAG over two ports and that was working fine, so I don't believe the issue is with the NAS
As for the 1 problem host that can't hit the NAS when both cables are connected, this is an SBS VM hosted on ESXI 5.1. the network is set up at the ESXi layer with 2 cables / NICs with the default / round robin way of handling it at the ESXi layer, so nothing configured at the switch.
there are other ESXi hosts with guests that can connect to the NAS fine, but i think they are ESXi 6.0
this seems like a bug to me, but I'm not sure exactly where to look to confirm it, all this was working fine on 2960's
Cheers