EnGenius EWS5912FP, User Manual

Page: 89 / 207

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Spanning Tree Loops
Loops occur when alternate routes exist between hosts.
Loops in an extended network can cause the Switch
to forward traffic indefinitely, resulting in increased
traffic and reducing network efficiency. Once the STP
is enabled and configured, primary links are established
and duplicated links are blocked automatically. The
reactivation of the blocked links is also accomplished
automatically. STP provides a tree topology and other
Spanning tree versions supported include STP, Multiple
Spanning Tree Protocol (MSTP), and Rapid Spanning Tree
Protocol (RSTP). Please note that only one spanning
tree can be active on the Switch at a time. The default
setting is: RSTP.
STP: Select whether to Enable or Disable the
spanning tree operation on the Switch.
Force Version: Select the Force Protocol Version parameter
for the Switch.
• STP (Spanning Tree Protocol) - IEEE
802.1D.
• RSTP (Rapid Spanning Tree Protocol) - IEEE
802.1w.
• MSTP (Multiple Spanning Tree Protocol) -
IEEE 802.1s.
Once a stable network topology has been established,
all bridges listen for Hello Bridge Protocol Data Units
(BPDUs) transmitted from the Root Bridge of the
Spanning Tree. If a bridge does not receive a Hello BPDU
after a predefined interval (known as the Maximum Age),
the bridge will assume that the link to the Root Bridge
is down and unavailable. This bridge then initiates
negotiations with other bridges to reconfigure the
network to reestablish a valid network topology.