What is the LSA Age field in the LSDB used for?

What is the LSA Age field in the LSDB used for?

• Version control, to ensure that the most recent LSA is present
• To age out old LSAs by removing an LSA when its age reaches zero
• For troubleshooting, to identify exactly when the LSA was advertised
• To age out old LSAs by removing an LSA when it reaches 3600 seconds

Explanation: LSAs are deemed invalid when they reach 3600 seconds, at which point they are purged from the LSDB.

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