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Opinions regarding Site configuration

I'm planning our AD and would appreciate the opinion of an independent party with regards to our site configuration.  Our AD will span 4 major sites, a Data Centre (DC), Head Office (HO), Warehouse (NDC) & Serverice Centre (SC).  The network topology is as follows:

                /  \
               /    \
              /      \
             /        \

All WAN links are 2MB

My instinct with regards to configuration is to create a site for each location.  I would create the following site links with the following costs:

DC-NDC - cost 1
DC-SC - cost 1
NDC-HO - cost 1
DC-HO - cost 1

each site link would contain the 2 sites need.

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1 Solution
-Your choice of replication partners & topology seem fine, good enough so that immediate change events will get to all 4 sites. This choice is not as important as controling inter-site traffic & unnecissary bandwidth usage by choosing a good replication schedule that conforms to your companys needs. The default cost lowest cost is 50 btw, Im not so sure assigning the same cost to every site link is very wise. To control traffic, you might want to have a higher cost assigned to one of the site links at each site.
Why ? Because you are doubling your bandwidth usage by forcing replication info to take both paths on an equal basis. Maybe you should have a lower cost to the root domain from each location, & an alternate incase the link is down. At the root domain you could designate a server as a bridge head server , handling all inter site traffic for the root domain.
hstilesAuthor Commented:

The above configuration was the one suggested by my colleague.  How about the following configuration - it's my idea:

2 site links -

one called Triangulated WAN, or similar containing DC, NDC and HO, since all three are connected to each other by the same type of link.  This link could have a cost of 50.

A second site link, DC-SC, linking the Data Cenre to the Service Division, again with a cost of 50.

There's no need us having bridgehead servers, as there is only 1 DC per site.

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