Introduction

These release notes contain important information about software version V4.0.0 for the BayStack* 450 Switch that may not be included in the related user guide Using the BayStack 450 10/100/1000 Series Switch (Part number

309978-D Rev 00). The information in these release notes supersedes the applicable information in the user guide.

These release notes contain the following sections:

•“Upgrading the BayStack 450 Firmware” (page 1)

•“The Upgrade Process” (page 2)

•“Creating a Mixed Stack” (page 4)

•“Accessing the Software Images” (page 5)

•“Upgrade Restrictions” (page 5)

•“Nortel Networks Online Documentation” (page 6)

•“New Features” (page 7)

•“Bug Fixes” (page 7)

•“Known Restrictions” (page 8)

•“Known Problems” (page 13)

•“Connecting to Accelar Gigabit Ports” (page 14)

•“1000BASE-LX Connectors” (page 15)

•“Network Management” (page 16)

Upgrading the BayStack 450 Firmware

The BayStack 450 firmware provides a code load facility that allows you to upgrade the software image over any switch port, including any MDA ports.

The BayStack 400-ST1 Cascade Module will not operate with BayStack 450 switches that are configured with BayStack 450 software versions earlier than version V1.1.0. You must upgrade all units with BayStack 450 software version V1.1.0 (or later) before installing the BayStack 400-ST1 Cascade Modules.

To access the software images, see “Accessing the Software Images” on page 5.

311523-C Rev 00