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Cisco Bug: CSCvu58082 - 3800AP with data DTLS encryption disconnect from 9800 due to CAPWAP keepalive after rx PMTU discover

Last Modified

Aug 21, 2020

Products (1)

  • Cisco Aironet 1850 Series Access Points

Known Affected Releases

ap-17.2.1.11 ap-17.3.0.82

Description (partial)

Symptom:
AP3800 disconnecting continuosly from 9800 running 16.12.X, 17.1.1s or 17.2.1

AP outputs of debug capwap client event/error/pmtu shows the following messages:
Kick Starting Dynamic Path MTU Discovery
PMTU: Sending MTU update to WLC: dcb->mtu
CAPWAP HW tunnel params changed, DELETING the existing
(...)
Going to restart CAPWAP (reason : data keepalive not received)...

Conditions:
Observed in flexconnect APs when ap link-encryption is configured and AP capwap MTU is lower than maximum (1485)
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