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Cisco Bug: CSCte00637 - 802.1Q tagged EAPOL Start message triggers authentication on the Cat3K

Last Modified

Jan 30, 2012

Products (104)

  • Cisco Catalyst 3750-E Series Switches
  • Cisco Catalyst 3750V2-24PS Switch
  • Cisco Catalyst 3560E-24TD-S Switch
  • Cisco Catalyst 3560-12PC-S Compact Switch
  • Cisco ME 3400-24TS-A Switch
  • Cisco Catalyst 3560E-48PD-SF Switch
  • Cisco Catalyst 3560G-48PS Switch
  • Cisco Catalyst 3560E-48PD-E Switch
  • Cisco Catalyst 2960-48TT-S Switch
  • Cisco ME 3400EG-2CS-A Switch
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Known Affected Releases


Description (partial)

IP phone is sending a tagged EAPoL Start frame into the switch port. The tag is neither the access VLAN nor the voice VLAN configured on the switch port but it triggers authentication.

Always seen.
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