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Absolute secure mac aging

As explained in Acing the CCNA Exam: Volume 2 Advanced Networking and Security

Absolute aging is a secure-MAC aging mode in which the aging timer starts when the address is learned and does not reset when frames are received.

Absolute aging removes a secure MAC address when its configured timer expires, even if frames from that address continue arriving. The timer starts when the address is learned and does not reset on traffic. section 12.2.2 section 12.3

Configure and verify

On interface F0/1, enter switchport port-security aging time 5, then verify show port-security interface f0/1. The output should show Aging Time: 5 mins and Aging Type: Absolute.

How Acing the CCNA Exam: Volume 2 Advanced Networking and Security covers it

How deep it goes
Defines timer startup, expiration, defaults, configuration, verification, and contrast with inactivity aging.
Examples
Uses Cisco interface commands and show port-security interface output for a five-minute F0/1 configuration.
What you can do after
Configure and verify a per-port absolute aging timer for secure MAC addresses.
How it connects
Connects port security, secure MAC address aging, inactivity aging, and secure static MAC addresses.
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Related concepts

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