How to setup a backup NameServer?

[Kevin Darcy]

I'm not sure this makes sense from an architectural standpoint. If all 
of the authoritative NSes are down, where is this "backup nameserver" 
getting its data from, and how current is that data?

If slightly *stale* data is acceptable, in the absence of all 
authoritative NSes, then why not just set up your "regular" 
nameserver(s) as stealth slaves of the zone(s)? Why dedicate a special 
"backup nameserver" for this function? What value does that add?

                             - Kevin
On 4/27/2014 11:30 PM, houguanghua wrote:
> Dear all,
>
> Does bind support backup nameserver? This nameserver isn't 
> regeristered and not accessed in normal situation. Only when all 
> authority NSs is down, this backup nameserver will be accessed by 
> Local DNS server.
>  How to configure this backup NS and how to configure in the local DNS 
> server?
>
> Thanks,
> Guanghua Hou
>
>
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