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In some cases, it is necessary to bridge replication If you create site links that overlap, you should create a site link bridge (see Figure 5-18) This will allow the replication to use the bridging site to create a direct connection to the destination site If you want to further control intersite replication within given sites, you can designate preferred bridgehead servers at the site The bridgehead server manages all intersite replication within a site All updates are received and sent through the bridgehead server Thus, no other DCs in the site need dedicate resources to intersite replication If you designate bridgehead servers, however the KCC will no longer be able to calculate replication routes automatically You will have to monitor replication closely to ensure that all sites are up to date
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TABLE 5-8 Recommended Link Cost per Available Bandwidth
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FIGURE 5-18 A site link bridge with bridgehead servers
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It is a good idea to calculate replication latency the time between a modification on a DC and the reception of the modification on all other DCs in the site topology This will allow you to identify what the longest possible replication delay can be within your network Replication latency is calculated based on the replication interval the time it can take to replicate data and the number of hops required to perform replication For example, if your site topology includes two hops, your replication interval is set at 180 minutes, and it takes 30 minutes to complete a replication change, your replication latency will be 420 minutes (180 times 2, plus 30 minutes times 2) Also, remember to base all your replication calculations on available bandwidth, not global bandwidth If only 10 percent of bandwidth is available for ADDS replication, it will affect your calculations Finally, as mentioned before, the Universal Group Membership Caching option is assigned to sites within a native WS08 forest This option should be set for all sites that do not have a GC DCs in these sites will be able to cache requesting users Universal Group Memberships, reducing the amount of communications with the server hosting the Global Catalog
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PART III
Best Practices for Site Topology Design
Use the following best practices to design your site topology: Use the default configuration for intersite replication Do not disable the Knowledge Consistency Checker Do not disable transitive trusts Do not specify bridgehead servers Calculate replication latency between sites Create sites according to network topology; site links and WAN links should correspond Make sure that no single site is connected to more than 20 other sites Each site must house at least one DC Do not use SMTP for domain-centric replication Do not use SMTP replication if at all possible Use 128 Kbps as the minimum WAN circuit for a site link Associate every site with at least one subnet and one site link; otherwise, it will be unusable Create backup site links for each site Assign higher costs to backup site links
Part III:
Design Server Roles
Create site link bridges wherever there are two or more hops between sites to reduce replication latency If your available network bandwidth can afford it, ignore replication schedules in all sites Replication will be performed when required with this option, but it will be demanding on WAN bandwidth Enable Universal Group Membership Caching in all sites that do not host a GC Use preferred bridgehead servers if replication must cross a firewall Size your DCs accordingly, as replication affects performance Monitor replication traffic once your forest is in place to determine the impact on your WAN links
T&T Corporation s Site Topology Scenario
T&T s site topology (see Figure 5-19) is once again based on the information displayed previously in Figure 5-17, as well as on the WAN link speed for each site Using this information, T&T produced the grid outlined in Table 5-9 T&T used some global settings in their site topology design These included: Open schedules for all sites KCC on by default in all sites All site link costs decrease as they get closer to HQ1, so HQ1 replication is prioritized Replication is only performed with RPC over IP Default schedules are enabled in all sites (replication every 180 minutes) High-priority replication can occur immediately Every site has a backup replication route at a higher cost Everything is based on calculated available bandwidth Of course, T&T will need to monitor AD replication performance during the operation of the directory to ensure that the values in this table are appropriate to meet service levels If not, both the table and the site links will need to be updated
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