DDNS Issues With Secondary/Slave Configurations

[Lokhandwala Akbar-E15102]

Hello All :
 
I have a couple of questions related to DDNS and Primary/ Secondary
Relationship of the DNS Server :
 
 
1. Is it possible to do a Zone transfer from a Slave Domain Name Server
to a Primary Domain Name Server. If yes can you please tell me what
statement will do that trick for me. 
 
2.  If I have a Master Slave configuration set up for my DNS Server with
Dynamic DNS , if the Master DNS server goes down , can the Slave DNS
Name Server perform Dyamic DNS ?  I have been seeing errors ( tail -f
messages ) that it is not able to perform forward update and it fails.
When I change the type to master from slave in the named.conf file , the
forward and reverse mapping works for me. But now I have both the DNS
servers as Master , in which case I cannot perform a zone transfer. How
do I overcome  this problem. 
 
3.  The goal is to have a Master/Slave configuration with DDNS working.
Even if the Master fails then the Slave should take over and continue to
perform DDNS for new devices/elements joining the network . When the
Master comes back up , then the Slave should do a Zone Transfer  to the
Master and then the  Master should again take the responsibility for
DDNS. Is this configuration possible. 
 
I have been reading a couple of Books like DNS and Bind and Pro DNS and
Bind , but I have not been able to figure out this configuration.
Any help will be greatly appreciated. Have a great day ahead
Thank you
Akbar Lokhandwala