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Tuesday, March 20, 2018

What are the three switch port states of the rapid spanning tree protocol (RSTP)?

What are the three switch port states of the rapid spanning tree protocol (RSTP)?

  • Blocking, Learning, Forwarding
  • Disabled, Listening, Forwarding
  • Discarding, Learning, Forwarding
  • Disabled, Blocking, Forwarding 
What are the three switch port states of the rapid spanning tree protocol (RSTP)?

EXPLANATION

There are 3 port states in RSTP (802.1w) that correspond to the three possible operational states. The 802.1D disabled, blocking, and listening states are merged into a unique 802.1w discarding state. The end result is faster reconvergence time. So the three switch port states are:
  • Discarding - No user data is sent over the port
  • Learning - The port is not forwarding frames yet, but is populating its MAC-address-table
  • Forwarding - The port is fully operational

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