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. Letās take a real-world example: š 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 doesnāt have an overlay tunnel to the Biz-Internet TLOC of vEdge-1. š» 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...
Cisco SD-WAN Overlay Management Protocol (OMP): A Comprehensive Guide Cisco SD-WAN Overlay Management Protocol (OMP): A Comprehensive Guide Cisco SD-WAN has revolutionized modern networking by offering scalable and intelligent network management solutions. A key component that drives the Cisco SD-WAN architecture is the Overlay Management Protocol (OMP) . This protocol plays a crucial role in establishing and maintaining the SD-WAN control plane, ensuring seamless communication across the network. What is OMP in Cisco SD-WAN? OMP is a TCP-based protocol, much like BGP, that enables communication between Cisco vEdge routers and vSmart controllers. It is responsible for managing the following critical functions: Transport Locator (TLOC) Distribution: Shares TLOC information across SD-WAN sites. Helps in route reachability by defining WAN transport characteristics. Service-Side Reachability: Distributes routing information from local interfaces, static routes, and dynamic protocols ...