Stream of Knowledge

 Fixing Cisco SD-WAN Blackholes with OMP Send-Backup-Paths The Problem: SD-WAN Blackholes During Link Failures In Cisco SD-WAN , the Overlay Management Protocol (OMP) is responsible for advertising routes between vEdges. However, by default, vSmart only advertises the best routes based on the OMP best-path selection algorithm. Let’s take a real-world example: 📍 Scenario: vEdge-1 has two Transport Locators (TLOCs): MPLS (T11) and Biz-Internet (T12). When the MPLS TLOC on vEdge-1 fails , it stops advertising the OMP route to 10.1.1.0/24 . vSmart selects the best available route , which still goes via vEdge-1 but over Biz-Internet. Problem? vEdge-3 doesn’t have an overlay tunnel to the Biz-Internet TLOC of vEdge-1. 🔻 Result: The route to 10.1.1.0/24 becomes invalid and unresolved . vEdge-3 completely loses connectivity to the data center despite having a valid tunnel to vEdge-2. Traceroute and ping fail to reach 10.1.1.1. The Solution: Enabling OMP Send-Backup-Paths By defau...