We have a single 10Gb fiber connection between 2 datacenters. All production servers are in our main datacenter. Recently we moved production application server workloads to the remote datacenter. We perfrom failover testing from time to time in the remote datacenter which requires us shutting down the 10Gb interface between the sites on our Nexus. Now that the production workloads are running in the remote datacenter we cannot shutdown the 10Gb interface. How can we perform testing without affecting the production workloads running in the remote datacenter? Currently all servers in the remote datacenter are running on a single VLAN with EIGRP routing between sites. I am looking for input on how to allow the production application traffic from the remote datacenter to our main site while still able to perform our failover testing in the remote datacenter. Any suggestions would be appreciated.