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Figure 35-11. Initial site-to-network mapping.
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After you have determined how many sites you will have, you next need to consider the design of each site. A key part of the site design has to do with naming the sites and identifying the subnets that are associated with each site. Site names should reflect the physical location of the site. The default site created by Active Directory is Default-First-Site-Name, and most site names should follow a similar naming scheme. Continuing the example, you might use the following site names:
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35
Part 7: Managing Active Directory and Security
Microsoft Windows Server 2003 Inside Out I ve used dashes instead of spaces, following the style Active Directory uses for the default site. I ve named the sites City-First-Site rather than City-Site to allow for easy revision of the site architecture to include additional sites at each location. Now, if a location receives additional sites, the naming convention is very clear, and it is also very clear that if you have a Seattle-First-Site, Seattle-Second-Site, and Seattle-Third-Site, these are all different sites at the Seattle location. To determine the subnets that should be associated with each site, use the network diagram developed in the previous section. It already has a list of the subnets. In your site documentation, simply note the IP subnet associations that are needed and update your site diagram to include the subnets.
Designing the Intersite Replication Topology
After you name the sites and determine subnet associations, you should design the intersite replication topology. You do this by planning the details of replication over each link designated in the initial site diagram. For each site link, plan the following components:
Replication schedule Replication interval Link cost
Typically, you ll want replication to occur at least every 180 minutes, 24 hours a day, 7 days a week. This is the default replication schedule. If you have limited bandwidth, you may need to alter the schedule to allow user traffic to have priority during peak usage times. If bandwidth isn t a concern or if you have strong concerns about keeping branch locations up to date, you may want to increase the replication frequency. In all cases, if possible you should monitor any existing links to get a sense of the bandwidth utilization and the peak usage periods. Calculating the link cost can be a bit complicated. When there are multiple links between locations, you need to think carefully about the appropriate cost of each link. Even if there is only one link between all your sites now, you should set an appropriate link cost now to ensure that if links are added between locations, all the links are used in the most efficient way possible. Valid link costs range from 1, which assigns the highest possible preference to a link, to 99999, which assigns the lowest possible preference to a link. When you create a new link, the default link cost is set to 100. If you were to set all the links to this cost, all the links would have equal preference for replication. But would you really want replication to go over a 128-Kbps link when you have a 512-Kbps link to the same location Probably not. In most cases, the best way to set link cost is to assign a cost based on the available network bandwidth over a link. Table 35-4 provides an example of how this could be done.
35
Part 7: Managing Active Directory and Security
Configuring Active Directory Sites and Replication
Table 35-4.
Setting Link Cost Based on Available Bandwidth
Link Cost
20 40 100 200 400 800 1600 3200
Available Bandwidth
100 megabits per second (Mbps) or greater 100 Mbps to 10 Mbps 10 Mbps to 1.544 Mbps 1.544 Mbps to 512 Kbps 512 Kbps to 256 Kbps 256 Kbps to 128 Kbps 128 Kbps to 56 Kbps 56 Kbps or less
Preference
Very high Moderately high High Above normal Normal Below normal Moderately low Low
You can use the costs in the table to assign costs to each link you identified in your site diagram. Once you do this, update your site diagram so that you can determine the route that will be used for replication if all the links are working. As Figure 35-12 shows, your site diagram should now show the names of the sites, the associated subnets, and the cost of each link.
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