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AD Site Topology Design [Inter Site Link Metric, Cost value, replication schedule]

Posted on 2014-02-13
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Last Modified: 2014-03-03
Hello,

I'm in charge of auditing our AD Site topology  (number of Site link, cost value, Replication schedule and Site link Bridge)

The thing is that i don't know what cost i should advise. I know the lower the cost value the more prioritize it will be)

Our environment is one Forest
Root Domain
Child domain is region domain (4 domains => One domain per region)


We have on our topology
1- Strategic sites where one of each site (Region big site) contain more than 10 RWDCs; and should replicate with one another. Good WAN => what site link Cost Value i should advise  ?

2- Hub Site (Region sites smaller than big sites) contain 2 RWDCs that should replicate with strategic sites  Good WAN => what site link Cost Value i should advise  ?

3- Remote site (Region sites smaller than Hub sites) contain 1 RODC or RWDC that should replicate with Hub sites. Poor Network WAN =>  what site link Cost Value i should advise  ?

NB: I know the numbers don't really matter, but i want is a cost value strategy that make sens, so that users from smaller Remote site don't authenticate on DCs in strategic site.

I need advise or related Document i can rely on.

Thank You
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Question by:AMATERASOU
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Jamie McKillop earned 500 total points
ID: 39857228
Hello,

You site link costs have nothing to do with what DCs your clients authenticate against. Your client will try to authenticate against all DCs in the same site then start randomly trying DCs in other site if none of the local DCs respond. The site link costs only control replication. In your case, I would put all your site link costs at 100. You only create links of different costs when you want to have backup links that are only used if the primary link goes down. For example, you create a link between A and B at 100, B to C at 100 and A to C at 200. In that case B would always replicate to A and C. A would only replicate with C if B is down.

-JJ
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