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Document the new unreachable cache behavior

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Update the documentaion to include information about how the cache's
exponential backoff works, and how to clear the cache.
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Aram Sargsyan 2025-04-15 14:57:52 +00:00
parent 14915b0241
commit 0f2fba46ad
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doc/arm/config-auth.inc.rst
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@ -87,6 +87,13 @@ The numbers in parentheses in the following text refer to the numbered items in
from the primary (as described in section 2 a. above). If the zone file has
changed, propagation is practically immediate.
.. Note:: When a primary server is unreachable, :iscman:`named` initially caches
that information for 10 seconds. After that initial period, :iscman:`named`
may try that server again; if the server remains unresponsive,
:iscman:`named` caches its unreachable status for up to 640 seconds using an
exponential backoff. During that time :iscman:`named` does not try to contact
the affected server. The cache can be cleared using :option:`rndc flush`.
The authoritative samples all use NOTIFY but identify the statements used, so
that they can be removed if not required.