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Cisco Bug: CSCut42591 - MAC flapping and crash on unauth ports with auth control-direction in

Last Modified

Jun 28, 2018

Products (251)

  • Cisco Catalyst 2960-S Series Switches
  • Cisco Embedded Service 2020 24TC NCP B Switch
  • Cisco Catalyst 3750V2-24FS Switch
  • Cisco IE 2000-4T-G Industrial Ethernet Switch
  • Cisco Catalyst 3560CG-8TC-S Compact Switch
  • Cisco Catalyst 3560X-48U-S Switch
  • Cisco Catalyst 3560X-48P-S Switch
  • Cisco Catalyst 3560X-48T-E Switch
  • Cisco Catalyst 2960S-24PD-L Switch
  • Cisco Catalyst 2960G-24TC-L Switch
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Known Affected Releases

12.2(55)SE9 15.0(2)SE6 15.2(2)E1 15.2(3)E

Description (partial)

the following symptoms are observed: 
- high CPU (up to 100%)
- device crash 
- spanning-tree loop
- MAC flaps (on unauth port)

In addition, when SPAN is configured on unauth port, packets are still captured.

interface with dot1x configured with 'authentication control-direction in'
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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  • Related Community Discussions
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