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Cisco Bug: CSCte29297 - 802.1Q tagged EAPOL Start message triggers authentication on the Cat4K

Last Modified

Mar 11, 2010

Products (1)

  • Cisco Catalyst 4000 Series Switches

Known Affected Releases

12.2(52)SG

Description (partial)

Symptom:
 We have a customer here that has a Siemens IP phone thats meant to do 802.1X.

However, the IP phone is sending a tagged EAPoL Start frame into the switch port. When the tag number corresponds to the access VLAN, authentication is triggered, when it should NOT, according to the 802.1X spec. See below:

Conditions:
Seen only when a 802.1Q tagged EAPoL Start frame is used to trigger 802.1X authentication on the switchport.
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