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Configuring the STP Timeout Interval
Context
If a device does not receive any BPDUs from the upstream device within the timeout interval, the device considers the upstream device to have failed and recalculates the spanning tree.
Sometimes, a device cannot receive the BPDU from the upstream device within the timeout interval because the upstream device is temporarily busy. In this case, recalculating the spanning tree will waste network resources. This can be avoided by increasing the timeout interval. However, only set a long timeout interval if the network is relatively stable.
The timeout interval is calculated as follows:
Timeout interval = Hello Time x 3 x Timer Factor