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Cisco Bug: CSCul22575 - ASA 8.4.6 MAC Address flapping with Port-Channels and IPv6

Last Modified

Nov 27, 2020

Products (2)

  • Cisco Adaptive Security Appliance (ASA) Software
  • Cisco Adaptive Security Appliance (ASA) Software

Known Affected Releases


Description (partial)

MAC address flapping logs seen on switch when IPv6 is enabled on transparent firewall. 

Enable mac-address-table notification mac-move, logs show MAC address of ASA flapping - %MAC_MOVE-SP-4-NOTIF: Host 0017.0f17.af80 in vlan 36 is flapping between port Gi6/2 and port Po20.

ASA running 8.4.6 in Multiple Context Mode
Also seen on ASA running
Transparent firewall
Port-channels and IPv6 Enabled on BVI
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