Exchange 2010 Edge & NLB

Dear All,

Does the Exchange 2010 SP2 Edge role support the NLB?
I want to install two Exchange 2010 SP2 Edge servers in my DMZ.

Thanks
ACS2012Asked:
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Mohamed KhairyEnterprise Solutions ArchitectCommented:
Yes, Egge Server Role support NLB and there are two ways to provide “Load Balancing”:

 1.Hardware Load Balancer
2.Software Load Balancer

Review this link:

http://www.msexchange.org/articles_tutorials/exchange-server-2010/high-availability-recovery/exchange-2010-edge-server-high-availability.html

Note: You don't really need to NLB a set of Edge Transport servers, instead you can create multiple equal MX records in your public domain for each.

Regards,
MKhairy

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ACS2012Author Commented:
I would like to ask:

1-      Is it better to use NLB or multiple MX records?
2-      If I use NLB, what the configuration recommended doing? Is there any guide which can help?
3-      It’s mentioned in the article, "To enable a full synchronization we need the following cmdlets in Exchange Management Shell", what he mean about the full synchronization?

Thanks
Kamalasekar ParthasarathyMessaging SupportCommented:
If your using your edge server as Application SMTP relay, then you can use for NLB otherwise you have to use Mulitple Mx records for external mail.

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ACS2012Author Commented:
hi Sekar,

what do you mean exactly? for what we can use the Edge more that SMTP relay?


Thanks
Kamalasekar ParthasarathyMessaging SupportCommented:

For Example in your network if you have any applications which is sending mail from the application server.. you can use the edge server as well for relay and those edge servers can be configured as a NLB cluster
Kamalasekar ParthasarathyMessaging SupportCommented:

If your going to use your edge server for External mail flow purpose, then you can use Multiple mx records with the same priority in Dns server..
Mohamed KhairyEnterprise Solutions ArchitectCommented:
Hi ACS2012,

Here are the answers :

1- Is it better to use NLB or multiple MX records?

- If you can, use NLB, it is more robust than DNS Round Robin (MX records) and offers high availability features you can’t get with DNS Round Robin because it's not a fault tolerant solution but if you can not use it so it's recommended to consider using a low TTL when creating the records.

2- If I use NLB, what the configuration recommended doing? Is there any guide which can help?

- it's depend on the type of the NLB whether you will use Hardware or software NLB, check this link and you will find all the needed info with the configurations:

http://technet.microsoft.com/en-us/exchange/gg176682

3- It’s mentioned in the article, "To enable a full synchronization we need the following cmdlets in Exchange Management Shell", what he mean about the full synchronization?

- Edge Servers are a specific design of Hub Transport Servers that don’t rely on Active Directory, their “Directory Service” is the “Active Directory Lightweight Directory Service (ADLDS), which probably was better known as “Active Directory in Application Mode (ADAM).

- The configuration and recipient data is kept up to date by periodically synchronizing changes from Active Directory to Active Directory Lightweight Directory Services (AD LDS). By default, configuration data is synchronized to AD LDS once every hour, and recipient data is synchronized to AD LDS once every four hours so you want to force EdgeSync synchronization to start initial replication immediately after you create the Edge Subscription.

Review this link: http://technet.microsoft.com/en-us/library/aa996383.aspx

Hope these will help you.

Regards,
Mkhairy
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