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Cisco Bug: CSCun52345 - AP sends TLS Alert with very high sequence number ff ff ff ff 00 00

Last Modified

Jun 26, 2014

Products (1)

  • Cisco Aironet 3700 Series Access Points

Known Affected Releases

7.6(100.0)

Description (partial)

Symptom:
AP sends Capwap_Data link Keep-Alive at every 30seconds when Capwap_Data encryption was enabled.
(config ap link-encryption enable all).
AP should tear down the Capwap_Data link DTLS tunnel by sending TLS Alert packet whenever it does not received Keep-Alive response from its associated WLC after retransmission.
The problem is the TLS Alert packet has very high sequence number (seq_num) in the TLS payload hence WLC does not honor the Alert message. As a result, AP cannot tear down the tunnel and keep sending Alert.

Conditions:
config ap link-encryption enable {all|APNAME}
No response from WLC for Capwap_Data link Keep-Alive.
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