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Question on AD replication

Hi

I had some questions on AD replication that I was hoping someone could help me with.

I have a multi-domain forest, company.com, with child domains eu.company.com, us.company.com and jp.company.com

In eu.company.com, we have AD Sites set up in Germany, UK, France, Holland and Switzerland. Each site has two DC's apart from Swizterland which has one.

If I check AD Sites and Services, I can see an IP Site link between UK and Switzerland. There are no preferred bridgehead servers. in the NTDS settings of SWISS-DC1, I can see an entry to replicate from UK-DC1 (and likewise for UK-DC1).

Question 1: Does this mean that SWISS-DC1 will *only* replicate to/from UK-DC1? Or will it replicate with other UK DC's too?

Question 2: Recently, France had 3 Domain Controllers, however one was decommisionned and DCPromo'd down. I can't see an IP Site link between France and Switzerland. Is it possible that FRANCE-DC3 was set up to replicate with SWISS-DC1, and when FRANCE-DC3 was removed from AD, the Site Link was automatically removed too?

Question 3: If I go to Inter-Site Transports > IP > Properties, I can see that 'Bridge All Site links' has been ticked. Does this mean that DC's can replicate with other DC's that aren't specifically mentioned in their NTDS Settings Properties?

Question 4: If I go to a DC, NTDS Settings, then I can see other DC's that it is set to replicate from. What is the meaning of this if it can replicate from other DC's in the forest/domain?

Thanks in advance!
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kam_uk
Asked:
kam_uk
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1 Solution
 
Jian An LimCommented:
you can always add a bridgehead manually.

I actually prefer the manual way. the autmatic way doesnt always do the right thing for you.

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kam_ukAuthor Commented:
Thanks...would you be able to my questions in turn (1 - 4) so that I understand more?

Would appreciate it!!
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Jian An LimCommented:
Question 3: If I go to Inter-Site Transports > IP > Properties, I can see that 'Bridge All Site links' has been ticked. Does this mean that DC's can replicate with other DC's that aren't specifically mentioned in their NTDS Settings Properties?


you are right, but it wont know how much it cost between sites. you probably don want them to replicate to all others. you probably got better connection between 2 sites, but not to all sites.

http://technet.microsoft.com/en-us/library/cc778718%28WS.10%29.aspx


Question 2: Recently, France had 3 Domain Controllers, however one was decommisionned and DCPromo'd down. I can't see an IP Site link between France and Switzerland. Is it possible that FRANCE-DC3 was set up to replicate with SWISS-DC1, and when FRANCE-DC3 was removed from AD, the Site Link was automatically removed too?


If there is no link between, there has no link replicate between. KCC will try to re-establish the connection but i don't personally rely on them.

remove a dc will remove the site link for sure.



Question 1: Does this mean that SWISS-DC1 will *only* replicate to/from UK-DC1? Or will it replicate with other UK DC's too?
Question 4: If I go to a DC, NTDS Settings, then I can see other DC's that it is set to replicate from. What is the meaning of this if it can replicate from other DC's in the forest/domain?

If you check on SWISS-DC1 /NTDS Settings, THE DC listed there is where SWISS-DC1 replicated from
If you check on UK-DC1 /NTDS Settings, THE DC listed there is where UK-DC1 replicated from

so if it doesnt list there, it is not replicated to anywhere, it is always to manually create them if they are not listed. although KCC might be try to re-enable the link



i might not explain it very well but the full document is located here.

http://technet.microsoft.com/en-us/library/cc787284%28WS.10%29.aspx
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