Recommendations

It is a recommended practice to design Active Directory sites following these rules of thumb:

• Create one Active Directory site per location. If the bandwidth between locations is above 10 Mbit/second and reliable, and you don't want to segment services or subnets, create one Active Directory site for these locations.
• Configure one Active Directory site link between two Active Directory sites.
• Configure a catch-all subnet, for instance a 10.0.0.0/8 subnet, in your main location and create subnets with smaller ranges, for instance 10.1.0.0/16 and 10.3.1.0/24 subnets, for other locations.
• Do not disable the Bridge all site links option for all IP-based site links and all SMTP-based site links.
• Do not enable the Ignore schedules option for all IP-based site links.
• Keep Bridge all site links enabled.
• Keep the ISTG enabled.
• Keep the KCC enabled.
• Keep Strict Replication...