Intersite replication windows

Site link bridges are a mechanism to logically represent transitive physical connectivity between sites. A site link bridge allows the KCC to use any combination of the included site links to determine the least expensive route to interconnect directory partitions held in those sites. The site link bridge does not provide actual connectivity to the domain controllers. If the site link bridge is removed, replication over the combined site links will continue until the KCC removes the links.

Site link bridges are only necessary if a site contains a domain controller hosting a directory partition that is not also hosted on a domain controller in an adjacent site, but a domain controller hosting that directory partition is located in one or more other sites in the forest.

Adjacent sites are defined as any two or more sites included in a single site link. A site link bridge creates a logical connection between two site links, providing a transitive path between two disconnected sites by using an interim site.

For the purposes of the intersite topology generator ISTG , the bridge implies physical connectivity by using the interim site. The bridge does not imply that a domain controller in the interim site will provide the replication path. However, this would be the case if the interim site contained a domain controller that hosted the directory partition to be replicated, in which case a site link bridge is not required. The cost of each site link is added, creating a summed cost for the resulting path.

The site link bridge would be used if the interim site does not contain a domain controller hosting the directory partition and a lower cost link does not exist.

If the interim site contained a domain controller that hosts the directory partition, two disconnected sites would set up replication connections to the interim domain controller and not use the bridge.

By default, all site links are transitive, or "bridged. This means that you can connect any site to any other site through a combination of site links. In general, for a fully routed network, you do not need to create any site link bridges unless you want to control the flow of replication changes. If your network is not fully routed, site link bridges should be created to avoid impossible replication attempts.

All site links for a specific transport implicitly belong to a single site link bridge for that transport. The default bridging for site links occurs automatically, and no Active Directory object represents that bridge. A global catalog server is a domain controller that stores information about all objects in the forest, so that applications can search AD DS without referring to specific domain controllers that store the requested data.

Like all domain controllers, a global catalog server stores full, writable replicas of the schema and configuration directory partitions and a full, writable replica of the domain directory partition for the domain that it is hosting. In addition, a global catalog server stores a partial, read-only replica of every other domain in the forest. Some directory updates, such as account lockout assignments and changes to account lockout policies, domain password policies, or domain controller account passwords, are examples of Urgent Replication.

Intersite Replication: Intersite Replication occurs when replication partners from two different sites. By reducing the frequency of Replication and allowing you to plan the availability of site links for Replication, Active Directory helps you save bandwidth between sites. Intersite Replication over each site link occurs every minutes, or 3 hours, by default.

This replication interval can be changed, and it can be reduced to 15 minutes. However, it is usually recommended to leave the default interval because intersite Replication happens across low-speed WAN links, and decreasing the replication interval could result in increased network traffic and latency.

On each domain controller, the KCC creates replication routes by creating one-way inbound connection objects that define connections from other domain controllers. Skip to content Home » Articles » What is Intrasite replication? May 13, by Admin. Table of Contents. Does Los Cabos have a Costco? For each hub site, create a table of the maximum latencies between the hub site and any of its satellite sites. For example, if replication occurs between New York and Washington, D.

For example, if the maximum latency between Seattle and its satellite site in Los Angeles is one day, the maximum replication latency for this set of links Washington, D.

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