We have a primary DNS server in the network but for some reason (likely due to security changes) it sometimes fails to respond DNS updates to the BIND slaves.
Is it possible to have a tiered slave system so if an urgent DNS record update is required when the primary server is partially unresponsive it steps down?
Master > Slave 1 > Slave 2
So Slave 2 would get DNS updates from Slave 1 rather than Master?
That way if need be we can turn a zone from slave to master instantly on Slave 1 and Slave 2 would get the updates for our zones until we sort out the issues on Master then we can simply return the affected zone on Slave 1 back to a Slave zone>