We have currently replaced our Dell network with a new Cisco based network. We have a weird issue that we can't seem to resolve. We have a DVR system that has four units that report to one server. The IP of the server displays the cameras of all four units in a web browser.
All of these units are on the same VLAN as the server except for two of them. For some reason, if you watch these two units in the web browser they will drop exactly every 10 minutes (600 seconds). This is the only visible indication that we have, however, we have been told that some users are having issues printing. They will print to a print server that is on another VLAN as well. There are a few client/server apps that have had issues as well. If we move these DVR units to the Server VLAN, there are no issues.
We have a 2821 Router, two 4900 Layer 3 switches that handle most of our routing, and 2960 switches all with a 10G fiber backbone. I have been looking all over for anything that is triggered or occurs every 10 minutes (600 seconds). We are at a loss with this. We have been looking at captures, isolating equipment, and patching things around to make this work. Looking for any advice. Thanks.