Planning Active Directory Sites in Visual Studio .NET

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5 Planning Active Directory Sites
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Intrasite replication occurs without a schedule because the Active Directory assumes you have fast, inexpensive, and available bandwidth within the site. However, replication between sites can be scheduled to avoid peak traffic hours. For example, suppose a particular site link always experiences a lot of traffic from 10:00 a.m. to 2:00 p.m. You can use the site link s schedule to block replication so that it cannot occur during those hours. Of course, the more time you block, the longer replication will take due to the delays, so again, you are faced with the proverbial juggling act to find what works best for your company and network.
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Understanding the Bridgehead Server
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When you create an Active Directory site, the Active Directory automatically assigns the role of bridgehead server to one domain controller. A bridgehead server sends and receives replication data for an Active Directory site. When the bridgehead server receives data from a remote site, it replicates that data to all other domain controllers throughout the site. In other words, domain controllers do not directly replicate data to domain controllers in other sites, but all exchange of information is performed through the bridgehead server, as shown in Figure 5-7. As you can see in Figure 5-7, the bridgehead server is considered the preeminent server for exchanging directory information between sites. As I mentioned, the Active Directory automatically assigns a bridgehead server when you create a new site, but you can change the bridgehead server to a different domain controller if desired. You may have a server with more system resources or a server who does not have as much user load that you prefer to use as the bridgehead server. At any rate, the bridgehead server should be a domain controller that has adequate system resources to handle the additional processing load placed on the bridgehead.
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An easy way to establish the bridgehead server is simply to use the domain controller in a site that has the best bandwidth and system resources, such as RAM and processor.
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Additionally, you can also specify additional bridgehead servers. At any given time, only one bridgehead server is used per site, but you specify additional bridgehead servers for backup purposes. For example, suppose your bridgehead server has a hard disk failure and goes down. The Active Directory will automatically select a new domain controller to be the bridgehead server, but you can control this automatic behavior by specifying additional bridgehead servers. This way, if the primary bridgehead server goes down, you have already preselected which domain controller should function as the replacement.
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You can learn how to select bridgehead servers in 8.
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Part I Planning an Active Directory Deployment
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SITE Figure 5-7: Bridgehead server
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5 Planning Active Directory Sites
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Understanding Site Link Bridges
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Replication between the Active Directory occurs through the use of Internet Protocol (IP) or Simple Mail Transport Protocol (SMTP). Protocol usage and replication is thoroughly explained in 13, so I m not going to repeat that discussion here. However, do understand that in most cases, IP is used to send replication traffic. With that said, we move to a discussion about site link bridges. When you create various site links in the Active Directory, the Active Directory automatically bridges those site links together if they use the same protocol (such as IP). Site link bridges are provided so that transitive connections can be made to other sites. For example, in Figure 5-8 you have an Atlanta site, a London site, and a Sydney site. Atlanta and London are connected by a site link, and London and Sydney are connected by a site link. Through the site link bridge, Atlanta and Sydney are transitively connected to each other through a logical link. To generate a cost of this logical link, the KCC adds the cost of the two links that connect the sites together. For example, in Figure 5-8, you can see that the site link between Atlanta and London has a cost of 1 while the link between London and Sydney has a cost of 10. So, the cost of the transitive site link is 11. The Active Directory configures the transitive link this way so that the actual, physical site links always have a lower cost than the transitive link. This feature ensures that traffic routing is always performed in an appropriate manner between physical and logical site links.
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