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Okay, so if I understand correctly, since TTL is 60s, after 60s or so are new records propagated?

Hello all,

I have a specific situation, and since I'm not that quite experienced with DNS servers I would really appreciate your help.

Domain test_domain.com have public nameservers ns1.test_domain.com and ns2.test_domain.com.

Both of these servers have different A records, as you can see from the image.



Now, the configuration of the network is like this :
1. When Primary link is up, backup link is down, and so only DNS Server 1 is visible from the Internet.
2. When Backup link is up, primary link is down, and so only DNS Server 2 is visible from the Internet.

Assuming that TTL of the A records are 60s, the question is, when primary link goes down, and backup link goes up, how long before DNS Server 2 records are visible from the Internet?

Thanks.