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What is the default time that STP (802.1D) takes to converge from blocking to forwarding state?
50 seconds
15 seconds
6 seconds
2 seconds
Convergence happens when all ports on bridges and switches have transitioned to either the forwarding or blocking modes. The ports on a bridge or switch running STP can transition through five different states. When the network needs to re-converge, the Listening state takes about 15 seconds, followed by the Learning state that usually takes another 15 seconds, and 20 seconds to change to Forwarding, Blocking or Disabled. If no timers have been changed the total time of convergence is about 50 seconds. For more information refer to: [http://www.tech-faq.com/spanning-tree-protocol.html]
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