Solved

Site and services - Failover to alt AD?

Posted on 2016-09-12
3
41 Views
Last Modified: 2016-10-25
I have an AD with 4 sites, each site has it's own AD ctrl.

Setting up sites and services with each site having it's own network in AD

Questions

1. What happens when the AD ctrl at a site is down?  does it randomly pick a different ctrl?
2. Is there a way to set the 2nd best option?
0
Comment
Question by:erikwhiteway
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 37

Accepted Solution

by:
Mahesh earned 250 total points
ID: 41795523
that can be controlled over alternate DNS settings under tcp/ip setting on client machines

I assume that all DCs are DNS server as well...

if local DC goes down, client will try to pick alternate DC (DNS) server

and to find best DC if local DC is not available, is depends upon how your site links are configured, it will try to get authentication from another member site in site link

so basically I suggest, you can create 3 site links total and put two sites in each site link, one site should be common in all site links

also users still can be logged on if no site to site connectivity is available and also if local DC is also down because of cached credentials on workstations...

Mahesh.
0
 
LVL 28

Assisted Solution

by:Dan McFadden
Dan McFadden earned 250 total points
ID: 41795525
Here is a simple description of the process:

1. When a client is booted, it queries DNS for a list of DCs.
2. It checks if the DC is in the local site by pinging the list of DCs.
3. If the DC is in the client's site, it uses that DC. Otherwise, it looks for the closest responding DC from the list in #1.  If no local DC responds, it uses the closest DC.

Here is an article about Site and Services config/design with some additional tech details.

Link:  http://blogs.msmvps.com/acefekay/2013/02/24/ad-site-design-and-auto-site-link-bridging-or-bridge-all-site-links-basl/

Another article about setting up site links.

Link:  https://windorks.wordpress.com/2014/03/14/single-ad-site-link-dont-do-it/

2. essentially you can control connection paths between sites by creating site links and setting the weight to control "routing" info.  Similar to weight in routing tables in network equipment (loosely said).  

Microsoft overview of AD Sites and Services.

Link:  https://technet.microsoft.com/en-us/library/cc731907(v=ws.11).aspx#BKMK_SiteLinks

Dan
0

Featured Post

Has Powershell sent you back into the Stone Age?

If managing Active Directory using Windows Powershell® is making you feel like you stepped back in time, you are not alone.  For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Learn how to PXE Boot both BIOS & UEFI machines with DHCP Policies and Custom Vendor Classes
Active Directory security has been a hot topic of late, and for good reason. With 90% of the world’s organization using this system to manage access to all parts of their IT infrastructure, knowing how to protect against threats and keep vulnerabil…
This tutorial will walk an individual through the steps necessary to join and promote the first Windows Server 2012 domain controller into an Active Directory environment running on Windows Server 2008. Determine the location of the FSMO roles by lo…
This Micro Tutorial will give you a basic overview of Windows DVD Burner through its features and interface. This will be demonstrated using Windows 7 operating system.

737 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question