52 CHAPTER 4: CONFIGURING THE SWITCH FROM THE WEB INTERFACE
tree network. The bridging device, known as the Root
Bridge, generates bridge protocol data units (BPDUs) 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
BPDUs initiated by the Root Bridge. If a bridge does not
get a Hello BPDU after a predetermined interval, the
bridge assumes that the link to the Root Bridge is
down. This bridge will then initiate negotiations with
other bridges to reconfigure the network to reestablish
a valid network topology.
After all the bridges on the network have determined
the configuration of their ports, each bridge only
forwards traffic between the Root Port and the ports
that are the Designated Bridge Ports for each network
segment. All other ports are blocked, which means that
they are prevented from forwarding traffic.
Three tabs are available on the Spanning Tree page:
■ Summary
■ Setup
■ Port Setup
Summary
Use the Summary tab to display Status, Edged Port, Link
Type, Path Cost, State, or Port Priority for all the ports.
Figure 40 Spanning Tree Summary Screen
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