SD-WAN Traffic not routing correctly or not taking expected path after changing Business policy.

Products

• VMWare SD-WAN
• VMware SD-WAN by VeloCloud
• VMware VeloCloud SD-WAN
• VMware VeloCloud SD-WAN Edge Appliance
• VMware VeloCloud SD-WAN with Premier Support

Issue/Introduction

After making changes to a business policy such as changing the Network Service between Direct, MultiPath, or Internet Backhaul, or changing the Link Steering options, among other changes, we will see that some or possibly no flows are following these new changes right away.

 

Cause

This is expected behavior in that such changes to business policies to not take affect on existing flows, only new flows will follow the new policies.

Resolution

To make the changes to business policies apply to existing flows, the flows will need to be flushed from the Remote Diagnostics page "Flush Flows" option, where we can flush all or only some flows based on source or destination IP.  This will cause a brief disruption to traffic.