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Chapter 7
Advanced Configuration for Compex SGX3226
7.1.2
STP Bridge
Spanning-Tree Protocol defines a tree that spans all switches in an extended network. It
forces certain redundant data paths into a standby (blocked) state. If one network
segment in the Spanning-Tree Protocol becomes unreachable, or if Spanning-Tree
Protocol costs change, the spanning-tree algorithm reconfigures the spanning-tree
topology and reestablishes the link by activating the standby path.
Spanning-Tree Protocol operation is transparent to end stations, which are unaware
whether they are connected to a single LAN segment or a switched LAN of multiple
segments.
This section shows how configuration is done in Spanning Tree parameters.
STP State
When STP is enabled, it will dynamically detect
network looping owing to mis-configuration of
the network topology. The redundant connectors
will be disabled to avoid looping of packets.
Looping would often result in flooding of
broadcast packets, halting the normal traffic.
Root Priority
The priority of the switch is currently acting as the
root. The bridge with the lowest value has the
highest Spanning Tree priority level and is related
as the root.
Hello Time
The Hello time of the Spanning Tree field shows
the number of seconds between the transmissions
of spanning Tree protocol configuration messages.
Forward Delay
The Forward Delay field shows the number of
seconds a port waits before changing from its
Spanning Tree Protocol learning and listening
states to the forwarding state. This wait is
necessary so that other switches on the network
ensure no loop is formed before they allow the
port to forward packets.
53
Figure 7.1-2
Configuration for STP Bridge
Max Age
The maximum age time of the spanning tree
shows the number of seconds the bridge waits
without
receiving
Spanning
configuration messages before attempting a
reconfiguration.
Tree
Protocol
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