Overlay-based oam for bgp fault detection

A system associated with a network controller, the system comprising:

• one or more processors;
• and
• one or more non-transitory computer-readable media storing instructions that, when executed, cause the one or more processors to perform operations comprising:
• initiating a test for a prefix by causing an Operations, Administration, and Maintenance (OAM) probe to be sent via a control plane path to one or more Border Gateway Protocol (BGP) peer devices, the OAM probe indicating a forwarding path to be used for sending traffic to a destination associated with the prefix;
• receiving, from a BGP router, a reply to the OAM probe, the reply indicating forwarding path information associated with the prefix;
• determining that a next-hop device is incapable of being utilized to forward the traffic to the destination based at least in part on a discrepancy between the forwarding path information indicated by the reply and expected next-hop information for the prefix;
• and
• performing a policy-based action based at least in part on determining that the next-hop device is incapable of being utilized to forward the traffic to the destination.

One or more non-transitory computer-readable media storing instructions that, when executed, cause one or more processors associated with a network controller to perform operations comprising:

• initiating a test for a prefix by causing an Operations, Administration, and Maintenance (OAM) probe to be sent via a control plane path to one or more Border Gateway Protocol (BGP) peer devices, the OAM probe indicating a forwarding path to be used for sending traffic to a destination associated with the prefix;
• receiving, from a BGP router, a reply to the OAM probe, the reply indicating forwarding path information associated with the prefix;
• determining that a next-hop device is incapable of being utilized to forward the traffic to the destination based at least in part on a discrepancy between the forwarding path information indicated by the reply and expected next-hop information for the prefix;
• and
• performing a policy-based action based at least in part on determining that the next-hop device is incapable of being utilized to forward the traffic to the destination.