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2.8
STP Function
STP Function connects the different LANs and broadcasts MAC frames.
In this device, the following functions are supported.
2.8.1 STP
This is IEEE 802.1D Spanning Tree Protocol (STP). The spanning tree is a function which prevents the loop when
multiple paths are connected. To achieve that, STP has only one path be a communication path and configures
the tree structure network logically.
By using this function, the loop of the frames connected with the system down is not generated. Moreover, a
strong network can be constructed for failure.
STP chooses the root bridge that is the root of the logical tree structure network. Then, it decide a STP port
mode for each ports. The mode is root port, designated port or blocking port. The root port and designated port
forward the packets though blocking port does not forward.
STP interface have the following states to achieve above function
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Blocking: This does not forward frames.
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Listening: Transitional state. This is the next state of the blocking when the port become forwarding state.
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Learning: Transitional state. This is the next state of the listening.
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Forwarding: This forwards frames.
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