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Excahnge 2007 Multiple Hub Servers Multiple Send Connectors

Posted on 2013-02-05
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Last Modified: 2013-02-11
Hello,

I am reviewing an Exchange 2007 environment and discovered that there are two HUB servers.  These two servers live in different locations.  One is in the data center and the other is in the main office that serves as a smaller data center but also has a fair number of users in it.

I noticed that each there are two Send Connectors and they just so happen to be named the same as the HUB Servers.     Each of the Send Connectors has a single source server which is the server by the same name. (I know that the naming has nothing to do with functionality)

In most environments I usually see a Send Connector and then it will have two source servers.  That is the way Exchange provides a certain level of HUB Transport redundancy.

So this place is set up this way:

Send Connector 1 Cost 1 -> Source Server HUB 1
Send Connector 2 Cost 10 -> Source Server HUB 2

So the question becomes, if Server HUB 1 goes down(server failure)  what happens?  Does Exchange automatically start using Send Connector 2.

I guess there may be some value in having the connectors set up this way so that one HUB server is preferred over the other and controlled by the Sender's Cost, but I would still want some level of assurance that the second connector/server combination would be used if the HUB 1 server failed.  Does the configuration I have outlined above provide such an assurance?
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Question by:BladesAway
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4 Comments
 
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irweazelwallis earned 500 total points
ID: 38856433
it should work but some of it will depend on the Active Directory Sites configuration and also where the CAS and Mailbox roles are installed.


One sure fire way of testing this is disabling the transport service on the primary/secondary and sending mails to make sure that sending from either site with either disabled still works.

The test would take 5-10mins and give you piece of mind.
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Author Comment

by:BladesAway
ID: 38856553
I can definitely fit a test in.  The mailbox server is in the HUB 1 location.  The servers are dual role CAS/HUB.  I'll probably break out the CAS roles sooner rather than later.
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Expert Comment

by:irweazelwallis
ID: 38856581
its not a problem have them on one server. It can make life easy i.e. less servers to patch.
MS now recommend not to split them out.

A test is the best way to ensure there is nothing hidden to catch you out.
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Author Comment

by:BladesAway
ID: 38877968
Here is the issue I have with having both roles on the same server --- especially in this environment.  One server is in one data center and the other is in the other Data center.  If the hub server goes down CAS service is lost as well. I'd rather have CAS access and then the other HUB server available for sending/receiving.
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