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Cisco Bug: CSCun18574 - Mac addresses are taking more than the configured time to age out.

Last Modified

Oct 24, 2018

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

4.2.0.BASE 4.3.2.BASE 5.0.0.BASE 5.1.1.BASE

Description (partial)

MAC sometimes ages out at half an age longer than configured. For instance, when MAC age is 10 minutes, it may take 15 minutes for the MAC to age out.

Assume a MAC is initially received from wire and learned on Asr9k at time 0. If the same MAC is seen again 1.5 minutes after the initial learning, the MAC age is extended with another half age. In the end, the MAC ages out at 1.5 times of the full age.
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