3Com 3CBLSF50 User Guide - Page 52

Type, Path Cost, State, or Port Priority for all the ports., tab to display Status, Edged Port, Link

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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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52
C
HAPTER
4: C
ONFIGURING
THE
S
WITCH
F
ROM
T
HE
W
EB
I
NTERFACE
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