I have recently begun an AD upgrade from 2003 to 2008R2. So far, the schema has been upgraded to 2008R2 and a new 2008R2 domain controller (GC and DNS) has been introduced. 3 other DCs are still running 2003 Server (all are GCs and DNS servers). I have ensure all of them have each other listed in their TCPIP dns settings.
All of these DCs are in the same site and same subnet (AD sites/services does have the subnet listed). DNS resolution forward/reverse is working correctly for all 4 of these DCs. Replication is working correctly, Exchange 2010 sees all 4, etc.
We are testing all applications/services for a few days before proceeding with moving of roles and replacing 2003 DCs with 2008R2 DCs.
My question is regarding replication partners. When I run the AD Replication Status Tool (or even repadmin /showreps), I notice that each DC seems to only have 2 of the remaining 3 DCs listed as its outbound replication partners. Should each DC not have all 3 of the others used as partners? I am assuming that the KCC knows what it is doing, but why would this be the case if the controllers are all in the same site/subnet?
In the AD Replication Status Tool I see (where DC1 is the new 2008R2 DC):
Dest Src
DC1 DC3, DC4
DC2 DC4, DC4
DC3 DC1, DC2
DC4 DC1, DC2
I am not sure if there is any action I need to take (like manually adding replication partners?)
Any advice would be appreciated.
