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&7TERRMRK8VII'SRGITXW
6IQETTMRK2IX[SVO8STSPSK]
If there is a change in the network topology due to a failure or the removal or addition of any active components, the active topology also changes. This may trigger a change in the state of some blocked ports. There are five (5) states that the ports can be in for spanning tree:
■Blocking: A port in this state does not participate in the transmission of frames, thus preventing duplication arising through multiple paths existing in the active topology of the bridged LAN.
■Listening: A port in this state is preparing to participate in the transmission of frames. The transmission of frames is temporarily disabled in order to prevent temporary loops, which may occur in a bridged LAN during the lifetime of this state as the active topology of the bridged LAN changes.
■Learning: A port in this state is preparing to participate in the transmission of frames.
■Forwarding: A port in this state is participating in the transmission of frames.
■Disabled: A port in this state does not participate in the transmission of frames or the operation of the spanning tree process.
