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Cisco Bug: CSCun12965 - Lightweight AP should not send jumbo frame by default

Last Modified

Mar 05, 2018

Products (41)

  • Cisco Aironet 3700 Series Access Points
  • Cisco AP802 Integrated Access Point
  • Cisco 888W Integrated Services Router
  • Cisco 881SRSTW Integrated Services Router
  • Cisco Aironet 1552I Outdoor Access Point
  • Cisco 892W Integrated Services Router
  • Cisco 861W Integrated Services Router
  • Cisco Aironet 1260 Access Point
  • Cisco Aironet 1040 Series Access Point
  • Cisco Aironet 2600i Access Point
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Known Affected Releases


Description (partial)

Lightweight AP may send CAPWAP packets whose size is larger than 1500 bytes for testing maximum Path MTU.
These large CAPWAP packets cause giant errors on a directly connected switch, if the switch does not enable jumbo frame support.
Because AireOS based Wireless LAN Controller does not support jumbo frame, this behavior should not be enabled by default.

This symptom may be observed by using Lightweight AP IOS version 15.2(4)JB and laters which support jumbo frame.

Related Community Discussions

Unknown protocol drops with AP2700
We've been deploying some AP 2700 within our offices and been observing some "unknown protocol drops" on the switchports where the AP's are connected.   The AP's are associated to a 7500 wireless controller, running code.  The AP's are in lightwight configuration with flexconnect configuration (4 vlans/SSID) associated.    On the switch port, the port has the following configuration :    description Cisco AP  switchport mode trunk  load-interval 30  spanning-tree portfast   I also specified ...
Latest activity: Mar 23, 2015
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