Telemetry flags rising CRC errors on one civic fabric optic between…

Question

Telemetry flags rising CRC errors on one civic fabric optic between leaf and spine. How should that finding rank in IP fabric troubleshooting?

Accepted Answer

Treat physical/optics errors as a high-priority root-cause class for intermittent loss and ECMP imbalance — CRC errors on a fabric optic are the check-engine light for that lane—intermittent drops and weird ECMP hash pain often start there. Pull the physical path to the front of the queue instead of blaming EVPN first.

Answer

Ignore CRC counters until BGP drops Established, because optics never affect forwarding while sessions stay up

Answer

Clear CRC counters daily as routine hygiene without inspecting the optic or cable

Answer

Attribute CRC spikes to EVPN route-type churn and dampen Type-2 imports first

Telemetry flags rising CRC errors on one civic fabric optic between leaf and spine. How should that finding rank in IP fabric troubleshooting?

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