Spanning Tree BPDUs include several timers that play an integral role in the operation of the protocol. The Spanning Tree timer values are contained in the last three fields of a BPDU. Within the Spanning Tree domain, the only timer values that are important are those that are sent by the Root Bridge. In other words, Non-Root Bridges are not concerned with locally configured timer values.
The default Spanning Tree timers go hand-in-hand with the IEEE 802.1D specification that recommends a maximum network . . .
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