802.1X Port Based Authentication - IP Phone- MDA - Port Security Violation
I have configured 802.1X authentication on selected ports of a Cisco Catalyst 2960S with Micorsoft NPS Radius authentication on a test LAN. I have tested the authentication with a windows XP laptop, a windows 7 laptop with 802.1X, eap-tls authentication and a Mitel 5330 IP Phone using EAP-MD5 aithentication. All the above devices work with with the MS NPS server. However in MDA mode when the 802.1x compliant windows 7 laptop is connected to the already authenticated Mitel IP Phone, the port experiences a security violation and the goes into error sdisable mode.
Feb 4 19:16:16.571: %AUTHMGR-5-START: Starting 'dot1x' for client (24b6.fdfa.749b) on Interface Gi1/0/1 AuditSessionID AC10A0FE0000002F000D3CED
Feb 4 19:16:16.645: %DOT1X-5-SUCCESS: Authentication successful for client (24b6.fdfa.749b) on Interface Gi1/0/1 AuditSessionID AC10A0FE0000002F000D3CED
Feb 4 19:16:16.645: %PM-4-ERR_DISABLE: security-violation error detected on Gi1/0/1, putting Gi1/0/1 in err-disable state
Feb 4 19:16:17.651: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/1, changed state to down
Feb 4 19:16:18.658: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1, changed state to down
If the port config is changed to "authentication host-mode multi-auth", and the laptop is connected to the phone the port does not experience the security violation but the 802.1x authentication for the laptop fails.
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