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Why does the interface MAC on the ISG-1000 change after an upgrade from ScreenOS 5.3 to 5.4 or later ?



Article ID: KB15450 KB Last Updated: 07 Oct 2009Version: 1.0
Interface MAC addressing order changed
Interface MAC changed after upgrading from ScreenOS 5.3 to ScreenOS5.4 or later.
The MAC addressing of interfaces in ScreenOS 5.3.0 and earlier versions was not in an ascending order to match the order of the slot/interface numbering; hence it was decided that it be set in ascending order to match the slot/interface numbering.

All ScreenOS 5.3r10 and below use the following order to assign the MAC addresses to the slots/interfaces-:
  1. Management Interface
  2. Interfaces in Slot 2
  3. Interfaces in Slot 3
  4. Interfaces in Slot 1
From ScreenOS5.4 and above the following order is used to assign the MAC addresses to slots/interfaces:
  1. Management Interface
  2. Interfaces in Slot 1
  3. Interfaces in Slot 2
  4. Interfaces in Slot 3
Please take note that  this discrepancy existed ONLY on the ISG-1000 platform and doesn't exist on any other platforms.
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