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Cisco Bug: CSCvs44289 - Switching Primary and Secondary unit roles results in duplicate MAC address seen on data interfaces

Last Modified

Jun 18, 2020

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases


Description (partial)

Duplicate MAC address seen on Active and Standby units data interfaces

This can be verified by running the following command on both units:

show interface | include MAC

The MAC addresses will be the same on Active and Standby unit which can cause network instability

FTD in Failover

Switching the Primary and Secondary units using the following steps:

1. Make Secondary unit as Active unit
2. Break HA
3. Reform HA with the previously Secondary Unit as the new Primary unit
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