Cisco Bug: CSCvv40252 - TCP SYN dropped on established connection for telemetry/TPA session
Oct 24, 2020
- Cisco ASR 9000 Series Aggregation Services Routers
Known Affected Releases
Symptom: Regular inbound telemetry probes intermittently fail for a small number of particular TCP ports. tcpdump of connection during failure shows repeated SYNs being sent for the same port, but no response from the router. Conditions: Could impact any TCP session to TPA application (e.g. telemetry) Only seen when there are stale TCP sessions in TPA. This may be caused by RPFO or by a s/w reload of IOS-XR (reload location all). Existing TCP sessions can be checked using netstat from bash.
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Bug Details Include
- Full Description (including symptoms, conditions and workarounds)
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