This topic explains how accelerated aging is used to retain network connectivity by reducing the address-aging time during spanning-tree reconfiguration events, allowing dynamic addresses to be quickly relearned and minimizing connectivity loss.
Accelerated aging is a mechanism that reduces the address aging time for dynamic MAC addresses during Spanning Tree reconfiguration, enabling the network to quickly relearn station locations and maintain connectivity.
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The default aging time for dynamic addresses is 5 minutes, set by the mac address-table aging-time global configuration command.
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During a Spanning Tree reconfiguration, the address aging time is accelerated to match the forward delay parameter value.
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Accelerated aging is applied on a per VLAN basis, affecting only the VLANs undergoing reconfiguration.
Accelerated aging reconfiguration
Accelerated aging ensures that after a spanning-tree reconfiguration, outdated dynamic MAC addresses are quickly removed and relearned, minimizing the period during which stations may be unreachable.
Accelerated aging in action
If a Spanning Tree reconfiguration occurs on VLAN 10, the switch accelerates the aging of dynamic addresses on VLAN 10 to the forward delay value, allowing the network to promptly relearn the correct station locations and restore connectivity.