Cisco Bug: CSCvi54256 - Stale MAC seen when dot1x is enabled on the switchport and IP phone is looped between to interfaces
Jun 14, 2018
- Cisco Catalyst 2960-X Series Switches
Known Affected Releases
Symptom: A stale MAC will be learned as static when ports of an IP Phone are looped to the switch causing BPDUguard and Err-disable recovery to bounce the interfaces several times. The issue is seen no matter if authentication mac-move permit is present or not. Conditions: 1. Issue is seen in a 7841 and a 7945 IP phone and the phone is looped between two switchport interfaces. Issue not isolated to a specific phone model. 2. Err-disabled auto-recovery enables the ports again every 5 or 1 minutes. 3. 802.1x is enabled on the switchport interfaces.
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Bug Details Include
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