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Trying to confirm if we need Link State Suppression or not

Posted on 2010-08-25
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Last Modified: 2012-05-10
Hello. We are upgrading from Exchange 2003 to Exchange 2010. Our plan is to install/configure Exchange 2010 adding it to the organization, then move the mailboxes and remove the existing Exchange 2003.

We have a single Exchange server, operating as front-end, back-end and OWA. Single Exchange on a single server box. In addition we are using Postini to scan outgoing email so there is a connector in the First Routing Group that defines the Postini SMTP as a smart host for all outgoing traffic. The questions is: do we need to enable Link State Suppression or not?

Also, what will happen if we enable Link State Suppression without needing it? I am thinking it may be simpler to just enable it and be on the safe side as opposed to trying to read the fine print of the requirements.
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Question by:adneprov
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Accepted Solution

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Jian An Lim earned 600 total points
ID: 33528902
Link State Suppression is not enabled by default. Before introducing Exchange Server 2007 into this topology, the 'SuppressStateChanges' configuration parameter should be set to '1' on Exchange 2003This parameter is essential if you plan to create multiple connectors to the dedicated Exchange 2007 routing group.

Reason: In earlier versions of Exchange, when a target server was unreachable, the down connector state was propagated throughout the Exchange organization by link state updates, and an alternative route was calculated. In Exchange 2007, when a message can't be relayed directly to the target server because of network problems, no alternative route is calculated. The message queues on a Hub Transport server in the closest reachable site to the point of failure. The purpose of this procedure is to make sure that routing loops cannot occur.  So that’s why we need to set it to value 1 in the registry

===========

I just enable it.
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Author Comment

by:adneprov
ID: 33529257
thanks for the answer. I am still confused whether this applies in our case. Based on what I am reading, Link State Suppression is required only "if you plan to add more than one connector between the Exchange Server 2010 server and existing Exchange Server 2003 servers". We are not going to do this. However we do have a connector between Ex2003 & Postini, and we will add a similar connector between Ex2010 & Postini. These are not connectors "between Ex2010 and Ex2003" so in theory they shouldn't affect anything, but i would like to make sure.

Also if I am reading the explanation correctly, Link State Suppression is irrelevant in an organization with a single Exchange 2003, so it is safe to enable it. Correct?
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LVL 37

Expert Comment

by:Jian An Lim
ID: 33529983
link state suppression is not used in exchange 2003. so you are right.
you can enable it safely.
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Author Comment

by:adneprov
ID: 33544809
thanks, will do that.
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Author Closing Comment

by:adneprov
ID: 33609591
The answer was generic (like a copy/paste from a manual) instead of focusing on the specifics of the case i had provided  
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