Important Considerations

The Upgrade Process

When you upgrade your BayStack 450 switch:

•Download two images (the boot code image and the agent image). The new boot code image must be downloaded before the agent image is downloaded.

•After upgrading your units, verify that the firmware and software versions, and the Interoperability Software Version Number (ISVN) is correct in the sysDescr field of the System Characteristics screen:

--The correct firmware version is: FW:V1.48

--The correct software version is: SW:v4.0.0

--The correct ISVN number is: 2

Note: When you upgrade to software version software version V4.0.0, you should also obtain a copy of Using the BayStack 450 10/100/1000 Series Switch (Part number 309978-D Rev 00). That user guide provides information about using the new software version V4.0.0 features. See “Nortel Networks Online Documentation” on page 6 to get the latest version of the user guide.

Recovering from a Failed Upgrade

The upgrade process is a fairly straightforward process when implemented correctly. However, if you do not follow the correct steps to upgrade your switch, the switch can become temporarily disabled.

•If you install a BayStack 400-ST1 Cascade Module before you upgrade the switch to software version V1.1.0 (or later), the code load facility may not function properly. To correct this situation, remove the BayStack 400-ST1 Cascade Module and upgrade the software properly before reinstalling it.

•If you try to download the agent image before you download the boot code image, the upgrade may fail: The agent software can detect an incompatible revision and will discontinue programming itself into FLASH memory. This condition is indicated by a steady pattern of alternating LEDs.

The switch will not automatically reset. To recover from this condition, you must cycle power to the switch, upgrade the boot software, and then upgrade the agent software.

311523-C Rev 00