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Cisco Bug: CSCuq02683 - 99xx Unable to let uplink switch failover to MAC address bypass mode

Last Modified

Oct 10, 2015

Products (11)

  • Cisco Unified IP Phones 9900 Series
  • Cisco Unified SIP Phone 3905
  • Cisco Unified IP Phone 9951
  • Cisco Unified IP Phone 6941
  • Cisco Unified IP Phone 6961
  • Cisco Unified IP Phone 8961
  • Cisco Unified IP Phone 8941
  • Cisco Unified IP Phone 9971
  • Cisco Unified IP Phone 8945
  • Cisco Unified IP Phone 6945
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Known Affected Releases


Description (partial)

Phones transmit EAPoL Start Packets at all times & hence DOT1X context is never deleted on the switch which prevents the switch from failing over to MAB.

The switch sends three EAP messages, 30 seconds apart, before MAB is attempted, but since the phone doesnt stop sending EAPoL Start Packets  the DOT1X context will never be deleted on the switch,which prevents the switch to failing over to MAB
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