Mac Retention After Multiple Take-Overs - Alcatel-Lucent OmniSwitch AOS Release 6 Manual

Configuring MAC Retention
If the primary element does not return to the stack after the elapse of the specified time interval, a trap is
generated, which notifies the administrator of a possible MAC address duplication. The trap and syslog
provide details about the slot number and the base MAC address of the removed former primary element.
Note. The duplication of MAC addresses in the network cannot be prevented in case of simultaneous fail-
ure of stacking links connected to primary stack element.

MAC Retention After Multiple Take-Overs

After multiple takeovers, if the new primary element still uses the MAC address of the former primary
element, you can release the MAC address or disable MAC Retention. In such a case, the stack will obtain
a new stack address from the EEPROM of the current primary element.
If you enable the MAC Retention feature again, the old MAC address released earlier will not be retained.
Thereafter, the stack will retain the MAC address of the current primary element during future takeovers.
OmniSwitch AOS Release 6 Network Configuration Guide July 2010
MAC Retention Overview
page 9-5