DC removed from site ! But replication happening.

Hello All,
My environment consists of 10 sites and 20 DCs. Windows server 2008 R2 - single domain single forest.
I run MS replication tool every week to monitor the replication status of my forest\domain.
From last week, users from a site reported with authentication issue after resetting the passwords w.r.t AD integrated applications and system logon.
Upon, i was checking on the reported site and found Two domain controllers were missing from the site, also the DC showing blank in site column in the DC OU in AD.
Again, i tried running MS AD replication report and found no issue reported. Surprised!. And logged in to those missing DC and executed repadmin /showrepl, repadmin /replsummary and found the replication was success with other DCs without any issues.
Can DC be part of replication without being present in AD SITES? could someone clarify? How it is getting replication with other DC.
Then, execute DCdaig and found errors like below in the missing DCs from site.
REPLICATION LATENCY WARNING
         ERROR: Expected notification link is missing.
         Source SERVERB1
         Replication of new changes along this path will be delayed.
         This problem should self-correct on the next periodic sync.
         REPLICATION LATENCY WARNING
Also, i am looking for how DC can get removed from AD sites apart from manual intervention.
Regards, 
Joe

Hi Joe,
Thanks for posting. 
You DC should be showing in sites and services somewhere, and should be present in ADUC and ADSIedit. 
Can you, from one of the DC's that are not showing do a DCDiag /a and post the results. 
Thanks
Denis
Regards,
Denis Cooper
MCITP EA - MCT
Help keep the forums tidy, if this has helped please mark it as an answer
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