Hope this is a simple question but it's driving me nuts.
I have a Cisco SG-300 switch which feeds several offices. In our training room because of lack of quantity of switch ports in that office we use a small workgroup switch (cisco 5 port) to connect 3 workstations. With a workstation connected directly to the SG-300 all is working fine. But when I connect these workstations through the workgroup switch things get weird.
All workstations use DHCP which is located on one of our servers on a different vlan. All other servers (resources) are generally on another vlan.
When the workstation is plugged into the WG switch it will receive the DHCP address ok but cannot connect to any resources on the network (printers, servers, internet, etc).
When that same workstation is plugged directly into the SG-300 everything works correctly.
This problem just started and it was working fine a few days ago.
The only change to the SG-300 was to add redundency through a LAG.
I have other workstations that plug directly into the SG-300 and they are working properly.