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Cisco Bug: CSCvv50796 - 2800 AP PMTU not reducing

Last Modified

Sep 11, 2020

Products (1)

  • Cisco Aironet 1850 Series Access Points

Known Affected Releases

8.5(151.0)

Description (partial)

Symptom:
AP doesn't reduce its path MTU even when ICMP unreachable messages from its forwarding router to reduce its MTU.  Wireless clients using EAP-TLS fails authentication during cert exchange ,wherein certificates encapsulated into larger frames cause issues, as 2800 AP is not decreasing the MTU size once it is getting ICMP unreachable error to fragment the packet with next hop MTU information for the capwap data frames.The AP continues sending frames with larger MTU and the capwap PMTU is not adjusted dynamically.

Conditions:
over the WAN when forwarding the router set with MTU value.
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