I have a DNS config that looks something like this:
www.example.com 600 IN CNAME prod.myzone.l2.company.example prod.myzone.l2.company.example 600 IN CNAME ssl-endpoint-12345.hostcorp.example ssl-endpoint-12345.hostcorp.example 60 IN A 192.0.2.4
So the first two CNAME records in the chain have a TTL of 10 minutes, and the final A record has a TTL of 1 minute
prod.myzone.l2.company.example CNAME does regional load-balancing between multiple endpoints, and is automatically updated if my DNS provider determines that the current endpoint is unhealthy. For this reason, I would like to propagate changes to the
prod.myzone.l2.company.example CNAME as quickly as possible.
If I wanted to reduce overall TTL that clients when
prod.myzone.l2.company.com, is it sufficient to only reduce the TTL of the
prod.myzone.l2.company.com record, or do I also need to reduce the TTL on the
www.example.com record as well?