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Cisco Bug: CSCuq02716 - BE 88XX Unable to let uplink switch failover to MAC address bypass mode

Last Modified

Jul 17, 2018

Products (34)

  • Cisco IP Phone 8800 Series
  • Cisco Unified IP Phone 9951
  • Cisco IP Phone 7841
  • Cisco IP Phone 8851
  • Cisco Unified IP Phone 7945G
  • Cisco Unified IP Phone 7962G
  • Cisco Unified SIP Phone 3905
  • Cisco Unified IP Phone 7911G
  • Cisco IP Phone 7821
  • Cisco Unified IP Phone 6941
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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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