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Disabling Link State updates in Exchange 2007 migration

Hi All,

We are currently running Exchange 2003 in our organisation. We have four different routing groups/domains; UK, US, Asia and Canada. The routing groups are arranged in a hub-spoke method, with US being central and where external emails are sent/to.

We have implemented CAS servers only in UK, Canada and Asia, and are about to bring on Hub Transports in these three regions. The plan was to create more than one RGC for redundancy purposes and efficiency. The Exchange 2003 routing group in each region will have a RGC to the Exchange 2007 Routing group.

According to MS, we should disable minor link state updates across the org before installing a second RGC;

http://technet.microsoft.com/en-us/library/aa996728.aspx

From what I can understand though, this will only be relevant once we have users on Exchange 2007 mailbox servers? Or even if we still have all users on 2003 Mailbox servers, do we still need to disable link state across the board? If so, why?

Thanks
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bruce_77
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bruce_77
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MesthaCommented:
I did a geographical migration just before Xmas and was getting all sorts of odd things happening until I switched off Link State on everything I could get my hands on. After a couple of hours (ie the time for Exchange to settle down and update its routing tables) everything behaved itself as expected.

So I would go with disabling it across the org.

Simon.
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bruce_77Author Commented:
Hi Simon

Thanks for getting back to me...

So, bearing in mind we are going to implement that HT servers in the regions first, including multiple RGCs to the Exch 2007 routing group, and *then* move mailboxes to Exch 2007 mailbox servers, would you recommend -

i) Disabling link state before we even implement the HT's
ii) Disabling link state after the HT/RGC's are in place, but before mailboxes are moved to 2007 mailbox servers
iii) It doesn't matter

Thanks again
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MesthaCommented:
Well I did it midway through, when I started seeing problems. In hindsight (wonderful thing that) I don't think I would change that. I would most likely wait to see what happens and if I get problems then I would make the change immediately.

Certainly if you are going to make the change the best time is going to be after the Hub role has been installed, because the first hub is key as it is the initial link between the Exchange 2003 side and the Exchange 2007. You would probably see problems at that point. Although they may not occur until you start to deploy additional hub transport servers in other sites. With just one it might be ok (if that makes sense).

Simon.
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