Design and Deploy High Availability for Exchange 2007 : Design Hub Transport High Availability

10/12/2010 3:53:59 PM
By default, Hub Transport servers are resilient. The Hub Transport role is registered in Active Directory; therefore, as you add more servers with the role, they are noted in the event of a failure. Load balancing within the site is automatically configured with however many Hub Transport servers you use.

The only time this isn’t the case is when the HT role is installed on the same server as the Mailbox role. This is logical because the Mailbox server will automatically use the local HT server.

Sometimes you might have a need to load balance your Hub Transport services. You wouldn’t do this for most scenarios; however, you might have an application that requires the relaying of messages. In the RTM version of Exchange, you might have considered a round-robin DNS or MX records, but with SP1, you have the capability to use a hardware or Windows-based NLB solution.


If you do need to use Windows NLB for your Hub Transport servers, the steps are pretty much the same as what we have for the CAS server to enable NLB between your servers. However, remember that NLB is not supported for load balancing your internal Hub Transport connections (which are handled automatically). You would seek only to use this solution on inbound SMTP connections from applications (perhaps a Microsoft Office SharePoint Server or a System Center Operations Manager solution) that submit messages to an Exchange organization through an SMTP relay (because the applications cannot log directly into a MAPI mailbox). These are unique scenarios, and we encourage you to research thoroughly your solution before load balancing your Hub Transport servers.

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