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Figure 35-12. Updated site design to show site names, subnet associations, and link costs.
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Considering the Impact of Site Link Bridging
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By default, Active Directory automatically configures site link bridges, which makes links transitive between sites in much the same way that trusts are transitive between domains.
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LAFirst-Site
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Part 7: Managing Active Directory and Security
Microsoft Windows Server 2003 Inside Out When a site is bridged, any two domain controllers can make a connection across any consecutive series of links. The site link bridge cost is the sum of all the costs of the links included in the bridge. Let s calculate the site link bridge costs using the links shown in Figure 35-12. Because of site link bridges, the domain controllers at the Chicago headquarters have two possible routes for replication to each of the branch office locations. The costs of these routes are summarized in Table 35-5.
Table 35-5.
Link and Bridge Costs
Link/Bridge Cost
800 2000 400 2400 400 2400 800 2000
Site/Link
Seattle Site Chicago Seattle Chicago LA Seattle LA Site Chicago LA Chicago Seattle LA New York Site Chicago New York Chicago Miami New York Miami Site Chicago Miami Chicago New York Miami
Knowing the costs of links and link bridges, you can calculate the effects of a network link failure. In this example, if the primary link between Chicago and Seattle went down, replication would occur over the Chicago-LA-Seattle site link bridge. It s relatively straightforward in this example, but if you were to introduce additional links between network locations, the scenarios become very complicated very quickly. The network topology used in the previous example is referred to as a hub-and-spoke design. The headquarters in Chicago is the hub, and the rest of the offices are spokes. Automatic site link bridging works well with a hub-and-spoke design. It doesn t work so well when you have multiple hubs. Consider the example shown in Figure 35-13. In this example, Chicago is the main hub, but because Seattle and LA have a spoke, they are also considered hubs.
35
Part 7: Managing Active Directory and Security
Configuring Active Directory Sites and Replication
VancouverFirst-Site 800
SeattleFirst-Site 800 400
NewYorkFirst-Site
ChicagoFirst-Site 400 800
LAFirst-Site 800
MiamiFirst-Site
SanDiegoFirst-Site
F35ws13
Figure 35-13. Additional sites added to original site design, making Seattle and LA hubs.
Site link bridging can have unintended consequences when you have multiple hubs and spokes on each hub. Here, when the bridgehead servers in the Chicago site replicate with other sites, they will replicate with Seattle, New York, LA, and Miami bridgehead servers as before, but they will also replicate with the Vancouver and San Diego bridgehead servers across the site bridge from Chicago-Seattle-Vancouver and from Chicago-LA-San Diego. This means that the same replication traffic could go over the Chicago-Seattle and ChicagoLA links twice. This can happen because of the rule of three hops for optimizing replication topology. The repeat replication over the hub links is made worse as additional spokes are added. Consider Figure 35-14. Here, the LA hub has connections to sites in Sacramento, San Diego, and San Francisco. As a result of site link bridging, the same replication traffic could go over the Chicago-LA links four times. This happens because of the rule of three hops for optimizing replication topology.
35
Part 7: Managing Active Directory and Security
Microsoft Windows Server 2003 Inside Out
VancouverFirst-Site 800
SeattleFirst-Site 800 400
NewYorkFirst-Site
1600 SacramentoFirst-Site 800 400
ChicagoFirst-Site 800
LAFirst-Site 800 800
MiamiFirst-Site
SanDiegoFirst-Site
F35ws14
SanFrFirst-Site
Figure 35-14. A site design with multiple spokes at hubs.
The solution to the problem of repeat replication traffic is to disable automatic site bridging. Unfortunately, the automatic bridging configuration is all or nothing. This means that if you disable automatic site link bridging and still want some site links to be bridged, you will need to configure those bridges manually. You can enable, disable, and manually configure site link bridges as discussed in the section entitled Configuring Site Link Bridges on page 1336.
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Planning the Placement of Servers in Sites
When you are finished configuring site links, you should plan the placement of servers in the sites. Think about which types of domain controllers and how many of each will be located in a site. Answer the following questions:
Will there be domain controllers If so, how many Will any of the domain controllers host a global catalog If so, how many Will any of the domain controllers host DNS If so, how many
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