What is a Site Link Cost?

I'm a Student trying to get MCITP. Please tell me when i am configuring Replication between sites, What is the site link cost means? What can i do from that? please tell me
Regards,
Ashane Deshapriya.
Ashane Deshapriya ( MCP )

Hi Ashane Deshapriya,
The cost setting on a site link object determines the likelihood that replication occurs over a particular route between two site. Relication routes with the lowest cumulative cost are preferred. You can use this procedure to configure replication cost on
the site link object in Active Directory Domain Services (AD DS). When you create or modify site links, use the site link object properties to configure the relative cost of using the site link.
For your information, please refer to the following articles to get more help:
Configure the Site Link Cost to Establish a Priority for Replication Routing
Configure site link cost
Regards,
Lany Zhang

Similar Messages

Site Link Membership

Can an AD site be a member of two different site links?
Our network is a full mesh MPLS with various link speeds so I would like to control what sites replicate with each other. For example, for 4 sites with the same high speed links I was going to create a site link called Core and set replication schedule to
every 60 minutes:
When sites are part of a site link, is a full mesh topology automatically created between them?
Also, if I then wanted to force a site with a low speed link to only replicate with one of the 4 core sites I.E. Site A would i just create another site link and add the core site and the new site? If so how would costing affect this scenario if at all?

Please keep in mind that just because you can do something, doesn't mean that you should. I have managed and advised site topology for years for hundreds of companies and only
very rarely is there a need to do what you are describing. Unless there is a specific business reason for doing so, I would personally not mess with the site link costing. Keep in mind, that technology was born from the need of the day.
When AD was introduced, connection speeds were painfully slow and bandwidth needed to be managed. Admins needed to prevent replication from saturating connections needed for business apps and users. Remember, a high speed link in those days 128k
to 256k. A far cry from the performance of every MPLS network I have seen.
Replication topology is largely controlled by the KCC and ISTG and I guarantee you can't out think the algorithm it uses. By throttling your replication you are effectively killing performance. For a fully routed MPLS network I would either
use the defaults or even consider using Change Notification so you are sending smaller chunks more often.
Again, unless you have a specific business reason for doing what you are proposing, I would recommend leaving it alone. My 2 cents.

Link Cost Question

Hello!
apologies for my bad English
Have read through different sites and services links and got stuck with few questions - I have recently taken over AD role from previous admin
our setup below please :
We have 4 physical sites
Dusseldorf, cologne, Frankfurt and nuremberg . Each of these sites have 1 Domain controller each and each site has 500 users .
( Dusseldorf near site is Cologne )
(Cologne near site is Frankfurt )
(Frankfurt near site is Nuremberg)
BASL is enabled and all 4 sites have netework connectivity.
There is only one site link with all 4 sites into the site link with site link cost 100 , when we did a DR activity , we found that
when Dusseldorf site was shutdown - No IP connectivity, clients were authenticating to Nuremberg rather cologne
and when started analyzing the behavior , I read through Ace fekay blog post
http://blogs.msmvps.com/acefekay/2013/02/24/ad-site-design-and-auto-site-link-bridging-or-bridge-all-site-links-basl/
I have two questions
^^ DO I need to remove 4 sites from site link and configure , 3 site links ? assuming one site has complete AD replica and other sites replicate from main site ?
^^ clients DNS on dusseldorf is configured with itself as primary and cologne site as secondary , when client queries the DNS LDAP for site specific records, will DNS check for site link cost ?
Eg: in the event of site failure
      - I restart the client
      - client in Dusseldorf queries primary DNS till the timeout and then it will query secondary DNS which is pointed to Cologne
      - Secondary DNS will return list of DC's from _LDAP._TCP.dc._msdcs.domainname
      - client sends the ping to dusseldorf DC and gets no result, but receives reply from all other 3 site DC's and one of the DC will refer client to particular site based on its IP subnet
         < does DC checks site cost before assigning site to subnet or site cost is only considered during replication ?

Just seeing this now. I agree with Paul's assessment and recommendations.
Just to touch base on the issue, you stated:
"( Dusseldorf near site is Cologne )
(Cologne near site is Frankfurt )
(Frankfurt near site is Nuremberg)"
"[...] when Dusseldorf site was shutdown - No IP connectivity, clients were authenticating to Nuremberg rather cologne."
I assume that you mean the DC in Dusseldorf was shutdown for the DR test. I see that you want the client to authenticate to Cologne. However, I'm not sure what you mean by "nearest" site, since AD can't tell how far a site is, whether a different subnet
locally or in another town, but the clients will use a number of things to failover querying for another DCs. Part of it is that if an optimal DC can't be located in its own site (as you've already probably read in Paul's KB link), it will look elsewhere,
but how does it do that? There are a number of mechanisms in place, and one of which is netmask ordering - using the longest subnet bits first. So the Dusseldorf and Nuremberg site subnets bits must be closest compared to Cologne. Here's a couple of good
discussions that will explain this more:
Good summary of Subnet Priortization, Netmask Ordering, and AD Sites, which is used first, etc.
Using Round Robin and Netmask Ordering for load balancing
http://social.technet.microsoft.com/Forums/en-US/winserverNIS/thread/0181af1e-be4d-4871-99d3-e7ea5d0ecf38/
Technet Thread - DNS issue : DHCP relay + VLANs + multiple AD Sites (Heavily discusses subnet prioritization and subnet bits)
http://social.technet.microsoft.com/Forums/en-US/winserverNIS/thread/ea03c013-7484-4a24-96be-d95219b69b3f/
And needless to say, there will be a period of time that the local machines in a site that have the DC cached. Now depending on the directory enabled apps installed (such as Outlook), will determine which ones are more tolerant than others. Outlook isn't
too tolerant. Restarting Outlook will make it pickup another DC for its DSProxy.
The operating system itself has its quirks with this, too.
If one DC or DNS goes down, does a client logon to another DC or use the other DNS server in the NIC?
http://msmvps.com/blogs/acefekay/archive/2009/11/29/dns-wins-netbios-amp-the-client-side-resolver-browser-service-disabling-netbios-direct-hosted-smb-directsmb-if-one-dc-is-down-does-a-client-logon-to-another-dc-and-dns-forwarders-algorithm.aspx
DNS Clients and Timeouts (Part 1 & Part 2), karammasri [MSFT] Dec 2011 6:18 AM
http://blogs.technet.com/b/stdqry/archive/2011/12/02/dns-clients-and-timeouts-part-1.aspx
http://blogs.technet.com/b/stdqry/archive/2011/12/15/dns-clients-and-timeouts-part-2.aspx
Ace Fekay
MVP, MCT, MCSE 2012, MCITP EA & MCTS Windows 2008/R2, Exchange 2013, 2010 EA & 2007, MCSE & MCSA 2003/2000, MCSA Messaging 2003
Microsoft Certified Trainer
Microsoft MVP - Directory Services
Complete List of Technical Blogs: http://www.delawarecountycomputerconsulting.com/technicalblogs.php
This posting is provided AS-IS with no warranties or guarantees and confers no rights.

My Site Links Not Working When Using Alternate Access Mapping

I have a SharePoint Site Collection under my main
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I had to extend this to an Intranet zone
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Hi Noel,
perhaps this thread is similar with your question:
http://social.technet.microsoft.com/Forums/sharepoint/en-US/d3010532-ae20-4eda-8f58-359f77d17e1e/user-profile-pictures-pointing-to-old-mysitehost?forum=sharepointadminprevious
any way, for your 2 questions,
perhaps you can give us more details about the scenario?
as i know,
mysite able to adjust, but you may need to configure the the host of the mysite, for example:
1. to the User Profile Service Application (UPA) and changed the MySite URL, few sites show the new URL and few show the old one.
2. to Central Admin and found there may 2-UPAs created.
3. changed the MySite settings on both the UPAs, created Managed Paths wherever necessary and then changed associations of all web applications to one of the main UPA
for configuring the multiple host, you may check with your IIS, and add the bindings,
http://forums.iis.net/t/1189870.aspx
http://stackoverflow.com/questions/14232892/multiple-sites-under-the-same-hostname-possible
Regards,
Aries
Microsoft Online Community Support
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Hi all,
Run into an issue where the 'Sharepoint Sites' link won't create in the user profile \ favourites when using the Connect to Office function from Libraries.
This is an on premise Sharepoint 2013 installation. Users connect to different Terminal Servers to access Office 2010 applications.
Issue only affects new users.
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time stamp key in HKCU\Software\AppDataLow\Microsoft\Office\14.0\Common\Portal but this path does not exist.
Logging the user into a Terminal Server that only has Office 2010 installed generates the correct Regkeys & the Sharepoint Sites link creates successfully in the user profile.
Has anyone else seen this or know of a fix to get around the Office2013 being used as the default regkey path?
Cheers

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Dear NC,
i have an issue with users in different Locations, to explain easyest here is a little network diagram:
So, as one can see, i have 4 Locations, one is the Headquarter.
The Target Goal is: Users in Location C must Logon with Domaincredentials from Sub.domain.tld from Location A.
Location HQ, A and B are fully routed, Location C has only a route to Location B.
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HQ<>A
HQ<>B
A<>B
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http://technet.microsoft.com/en-us/library/cc728188(v=WS.10).aspx
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SW-1(config)#
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