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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 ?

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Article ID: KB15450 KB Last Updated: 07 Oct 2009Version: 1.0
Summary:
Interface MAC addressing order changed
Symptoms:
Interface MAC changed after upgrading from ScreenOS 5.3 to ScreenOS5.4 or later.
Solution:
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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