Configure Subnets

In the Overlay Flow Control window, you can update the priorities of the destinations for the learned routes in the subnets.

Procedure

1. In the SD-WAN Service of the Enterprise portal, click Configure > Overlay Flow Control.
2. The Routes List section of the Overlay Flow Control window displays the subnets with the following details, as show in the image and table below.
   

   Option	Description
   Segment	Segment name.
   Subnet	The network that the route corresponds to along with a list of Edges that learned the route.
   Preferred VPN Exits	The route through which another branch can access the subnet.
   Route Type	Displays the type of the route, which can be one of the following: Static, Connected, or Learned.
   Last Update	The last updated date and time of the preferred VPN exit.
   Created On	Date and time when the route was created.
   IPv4 Subnet
   Eligible VPN Exits

   Note: You can configure the subnets for both IPv4 and IPv6 addresses.

   Currently, you can view up to 256 subnet prefixes in the API call request. You can use the Filter option to search for the specific subnet prefix. The following information message appears if the results are more than the server could return. "There are more results that the server could return. Please narrow your search criteria."

   Select one or more subnets and click MORE to perform the following activities:

   • Pin Learned Route Preference – Pins the preferences of the selected learned route.
   • Unpin Learned Route Preference – Unpins the preference of the selected learned route to default settings.
   • Delete Learned Routes – Deletes the learned routes. This option does not delete the connected routes, static routes, routes from Overlay Flow Control, and routes from Edge Route table. The option is available only when Configure Distributed Cost Calculation is turned off.
3. Click the Edit Subnet option for a subnet to modify the priorities of the preferred destination.
   1. In the Subnet window, you can move the destinations from the Eligible VPN Exits to Preferred VPN Exits and vice versa.
      
   2. In the Preferred VPN Exits panel, click the UP and DOWN arrows to change the priorities and click Update.
   3. You can reset the cost calculation for the subnets when there are pinned routes available. Click Reset, which enables the Orchestrator to clear the pinned routes, recalculate the cost for the selected subnet based on the policy, and send the results to the Edges and Gateways.
      Note: For IPv4 Routes, the Reset option is available only when Distributed Cost Calculation is enabled.

      Note: The Reset option is available only when Distributed Cost Calculation is enabled.

      For more information on Distributed Cost Calculation, refer to the Configure Distributed Cost Calculation section in the VMware SD-WAN Operator Guide available at: https://docs.vmware.com/en/VMware-SD-WAN/index.html.