A switched internetwork has converged
when all the switch and bridge ports are in either the forwarding or
blocked state. Forwarding ports send and receive data traffic and BPDUs.
Blocked ports will only receive BPDUs.
When the network topology changes,
switches and bridges recompute the Spanning Tree and cause a disruption
of user traffic.
Convergence on a new spanning-tree
topology using the IEEE 802.1D standard can take up to 50 seconds. This
convergence is made up of the max-age of 20 seconds, plus the listening
forward delay of 15 seconds, and the learning forward delay of 15
seconds.
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Lab Activity
Lab Exercise: Spanning-Tree Recalculation
In this lab, the student will create a basic switch
configuration and verify it and observe the behavior of spanning
tree algorithm in presence of switched network topology changes.
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Lab Activity
e-Lab Activity: Spanning-Tree Recalculation
In this lab, the students will create a basic switch
configuration and verify it. 
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Web Links