3Com 2848 SFP User Guide - Page 43
Spanning Tree, Bridge generates BPDUs Bridge Protocol Data Units
UPC - 662705502243
View all 3Com 2848 SFP manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 43 highlights
Figure 25 Upgrade Screen Once you have downloaded the software, use the Browse button to locate the file on your computer, and then click on Apply. You may need to change the file type in the dialog box displayed by your Web browser to *.* to be able to see the file. The file will be copied to the Switch, and once this has completed, the Switch will restart. Although the upgrade process has been designed to preserve your configuration settings, 3Com recommends that you make a backup of the configuration beforehand, in case the upgrade process fails for any reason (for example, the connection between the computer and the Switch is lost while the new software is being copied to the Switch). Using the System Tools 43 The upgrade procedure can take a few minutes, and is complete when the Power LED has stopped flashing and is permanently green. Make sure that you do not interrupt power to the Switch during the upgrade procedure; if you do, the software may be corrupted and the Switch may not start up properly afterwards. If the Power LED continues to flash after a failed upgrade, refer to "Troubleshooting" on page 45. Spanning Tree This administrative tool supports the configuration of the Switch to forward, or block and discard 802.1D spanning tree BPDU packets. Spanning tree is a bridge-based system for providing fault tolerance on networks and can be used to detect and disable network loops. The spanning tree ensures that the optimal path is maintained between spanning tree-compliant networked devices by: ■ Disabling redundant paths when the main paths are operational. ■ Enabling redundant paths if the main paths fail. Spanning tree uses a distributed algorithm to select a bridging device that serves as the root of the spanning tree network. The bridging device known as the Root Bridge generates BPDUs (Bridge Protocol Data Units) on all ports at a regular interval known as the Hello Time. All other spanning tree-compliant devices on the network have a designated Root Port. This is the Port nearest the Root Bridge and it is used for receiving the