A question regarding the db.cache file

[Klas Bengtsson]

Hi!

I am running a BIND 9.3.0 name server. As I understand it, when BIND first 
starts up, a very low random RTT value is given to each DNS server listed in 
the db.cache file. This ensures that the name server queries all name 
servers before choosing the nearest. If this server, however, becomes 
unreachable, then another one is selected.

What I would like to know is what triggers the coming back into play of the 
first server (once the fault is removed)?

BR,
Klas

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