Domain Name Server (DNS) IP SLA operations measure the difference in time from when a DNS request is sent and when the reply is received. These operations ensure that your DNS servers are operational and are performing as expected.
You cannot add operations that have been previously created with SolarWinds VoIP and Network Quality Manager. If you have already created an operation with the same operation number, you must manually remove the operation from the device.
To add DNS IP SLA operations to your network devices:
If you do not see your IP SLA routers in the list, you must add the devices before you can continue. For more information, see Adding Devices for Monitoring in the Web Console.
VRFs only exist on provider edge routers (PE). A VRF is a routing and forwarding table instance, and you can have more than one VRF per PE. The VRF includes routes that are available to a certain set of sites. A VRF is named based on the VPNs it services and on the role of the customer edge (CE) router in the topology.
Depending on the number of operations that are being created, this process can take several minutes to complete.