Comprehensive Explanation: In Spanning Tree Protocol (STP), the Message Age in the BPDU (Bridge Protocol Data Unit) sent by the root bridge is set to 0. As BPDUs are forwarded by non-root switches, the Message Age is incremented. This timer is used to ensure that outdated information is not propagated indefinitely through the network. If the Message Age reaches a configured maximum value, the BPDU is discarded, and the network topology is recalculated.
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