STP Max Age

The Max Age is a value contained within BPDUs which are used by the Spanning Tree Protocol (STP). The full contents of a BPDU can be found here: STP contents of a BPDU.

The Max Age value has two functions:

  • It indicates the age in seconds at which time the current BPDU should be discarded. By default, this value is set to 20 but can be anything from 1 to 40.
  • It acts as a maximum value for the Message Age parameter in the BPDU.


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