A parks department sees overlay brownouts that correlate with one transport color flapping BFD while vSmart control connections stay up. What is the most accurate first troubleshooting framing?
Select an answer to reveal the explanation.
Short Explanation
If BFD on one color is bouncing but the controllers still answer, you have a bad road, not a dead dispatch center. Split underlay transport problems from overlay control-plane problems before you reboot the world. Blaming LISP on a pure SD-WAN park site just sends the truck to the wrong warehouse.
Full Explanation
When a parks department sees overlay brownouts correlating with one transport color flapping BFD while vSmart control connections stay up, the accurate first framing is to separate underlay transport/BFD failure on that color from overlay control-plane health, then validate AAR and TLOC state. Control plane can be healthy while a single underlay color is sick.
Assuming OMP failed globally because any BFD event destroys all controller sessions overgeneralizes; BFD color loss need not kill DTLS control connections.
Reloading every vManage node first because underlay colors are configured only there is the wrong first move and misplaces color attachment (on Edges) versus management UI.
Treating it as an SD-Access LISP map-cache failure on an SD-WAN-only site applies the wrong architecture’s troubleshooting model.
Exam caveat: check which apps/SLAs bind to the flapping color—AAR may be switching or blackholing depending on policy.
Operational check: inspect BFD/TLOC state for the color, confirm vSmart sessions up, and watch AAR path changes during the brownout. File a parks transport incident note distinguishing underlay color vs control plane. In municipal operations, record the rationale in the change ticket so future on-call staff know which control was chosen and which failure modes the rejected options would create for city services. Re-validate after the next maintenance window that the same control still holds under the platform code and policy revisions used by the civic network team.