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Cisco Bug: CSCuo05243 - 802.1x in single-host with a phone using CDP bypass causes err-disabled

Last Modified

Feb 19, 2018

Products (175)

  • Cisco Catalyst 2960-S Series Switches
  • Cisco Catalyst 2960S-F48FPS-L Switch
  • Cisco Catalyst 3560X-48U-S Switch
  • Cisco Catalyst 3560E-48PD-SF Switch
  • Cisco Catalyst 2960C-8TC-S Switch
  • Cisco Catalyst 2960G-24TC-L Switch
  • Cisco Catalyst 2960-24-S Switch
  • Cisco Catalyst 2960C-12PC-L Switch
  • Cisco Catalyst 3560-12PC-S Compact Switch
  • Cisco Catalyst 3750V2-24FS Switch
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Known Affected Releases

15.0(2)SE1 15.0(2)SE5

Description (partial)

Symptom:
port goes into err-disabled when a PC and phone is at the same time connected to single switchport

Conditions:
-- 802.1x in single-host mode
-- phone + PC on the same port
-- phone is using CDP bypass to gain network access
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