WAN circuit triage
Do not use for SD-WAN policy (use sdwan-overlay-architect). Not for LAN.
Procedure
- Identify the circuit ID, A/Z ends, last-mile vendor, and the logical overlay color.
- Physical: admin-up, protocol-up, Rx light in spec, CRC/FCS trend, not a one-second blip.
- Logical: IP reachability to the PE, BFD, QoS drops. Capture 30 seconds if the fault is intermittent.
- Open the ISP ticket with circuit ID, timestamps in UTC, light levels, and a ping plot. Ask for an RFO clock.
- Verify restore: BFD up, error counters flat, overlay SLA recovered.
ckt: IAH-2401-MPLS-001 Rx -8.2 dBm (spec -2 to -12)
CRC 4.1e5 last 15m BFD down 00:12:44Z
PE 192.0.2.1 unreachable
Anti-patterns
- Never bounce BGP to "see if it comes back" before the physical check.
- Do not give the ISP a screenshot with no circuit ID.
Safety
Interface flaps are emergency-only and logged.