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Cisco Employee

Unity /Exchange replication over 4T1 links

An enterprise customer wants to deploy CM and Unity in one main location with Unified Messaging. However there corporate Exchange server is located at another main office location seperated by a WAN 4T1s .<br>The corporate policy is that the users will have to still reside on the corporate Exchange Server located over 4T1 WAN from the Unity/Exchange server.<br><br>Question1: Can the Exchange Servers still communicate/replicate over the 4T1 (using Site Connectors) and is the bandwidth 4T1 enough (this bandwidth is to accomodate all data+voice traffic)<br><br>Question2: As the customer's enterprise policies are such that the Exchange users can NOT be rehomed to the new Exchange server on the Unity site, is there any other way for the Exchange Users message store NOT to have to cross over the WAN (like getting a local copy of the Exchange Message store, local cache) on the newly installed Exchange server.<br><br>TIA<br><br>

4 REPLIES
Anonymous
N/A

Re: Unity /Exchange replication over 4T1 links

Exchange databases do not replicate. The bandwidth available could easily allow for these 2 exchange servers to be in the same site/routing group. You do not need 2 exchange servers. Since you are using unified messaging and you have adequate bandwidth this set up is really the same as if the unity box and the exchange server are in the same room. just install unity and specify the corporate exchange server as the message store.

John Messina
Network Engineer
Crimson Technologies Inc.
jmessina@crimsoncti.com
http://www.crimsoncti.com

Anonymous
N/A

Re: Unity /Exchange replication over 4T1 links

"this set up is really the same as if the unity box and the exchange server are in the same room"

I'd have to disagree with that. What happens if 40 subscribers call into Unity to listen to their messages over the phone? Those messages are going to be streamed across the T1s from Exchange to Unity.

Steve Olivier
Software Engineer
Cisco Systems

Anonymous
N/A

Re: Unity /Exchange replication over 4T1 links

You make a very good point. I was speaking from a mail routing perpective. I may have oversimplified however he did not specify the number of users in the environment or the pre-unity load on these links. It does not seem lihe has much of a choice. Alternative suggestion?

John Messina
Network Engineer
Crimson Technologies Inc.
jmessina@crimsoncti.com
http://www.crimsoncti.com

Cisco Employee

Re: Unity /Exchange replication over 4T1 links

We are currently looking at 30-80 subscribers with the intent to get all 800 subscribers using the same corporate Exchange server over the 4T1s.

As Steve points out, we will have a major bandwidth issue at that time let alone the fact that I still need to prepare for the possibility that the WAN (4T1s) may go down.

In Unity 3.1 is the architecture not designed so that if the Exchange server would fail, all voice mail messaged and greetings will still be left/played because Unity 3.1 stores a local copy of subscriber messages and greetings in a local cache?

Is there really a way to design this solution so as to have Unity subscribers , users, vm, greetings still functional in case WAN went down..on a local Exchange server.Keeping in mind the customer's requirements: wants to use existing Exchange server at headoffice and has 4T1 WAN?



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