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Manual Chapter: Optimizing MAPI Traffic over the WAN
Manual Chapter
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About optimized applications for WAN Optimization

An optimized application in the WAN Optimization Manager (WOM) context is a virtual server with which the BIG-IP system associates an iSession profile and other relevant WAN optimization profiles. WAN optimization on the BIG-IP system requires an optimized application on the initiating side of the WAN and an iSession listener (iSession-terminating virtual server) on the receiving side of the WAN to complete the connection for all application traffic.

For some types of application traffic, such as CIFS and FTP, the system also requires an application-specific virtual server (also listed as an optimized application) on the receiving side. After the iSession listener terminates the connection, BIG-IP WOM directs the traffic to this virtual server for additional handling. Being able to create more than one virtual server for an application on the receiving side allows you to apply different profiles to selected application traffic that has different destinations.

For each application you select on the Quick Start screen, BIG-IP WOM automatically configures an optimized application. In addition, you can customize the system-supplied optimized applications and manually create new ones to specify where and how you want BIG-IP WOM to optimize specified application traffic.

About MAPI optimization

Messaging Application Program Interface (MAPI) is the email protocol that Microsoft Exchange Server and Outlook clients use to exchange messages. Optimization of MAPI traffic across the WAN requires a virtual server for each Exchange-based server so that the BIG-IP system can use the IP addresses of the Exchange-based servers to locate MAPI traffic.

You can configure WAN Optimization Manager (WOM) to automatically discover the Exchange-based servers and create virtual servers for them, or you can create the virtual servers manually using Local Traffic Manager. The advantage to automatic discovery is that when new Exchange-based servers are added to the network, or the IP addresses of existing servers change, BIG-IP WOM discovers the changes and creates new MAPI virtual servers for the new and moved Exchange-based servers.

Enabling Microsoft Exchange compression for MAPI optimization

The system-supplied profile named mapi is configured to optimize MAPI traffic over the WAN through an iSession connection. By default, Microsoft Exchange native compression is disabled, which allows WAN Optimization Manager (WOM) to use symmetric adaptive compression for better results than if you enabled native compression. If you want to enable native compression, you can modify the MAPI profile, as follows.
  1. On the Main tab, click Local Traffic > Profiles > Services > MAPI. The MAPI profile list screen opens.
  2. Click mapi. Alternatively, you can click Create, and save the new MAPI profile you create with a different name.
  3. For the Native Compression setting, select Enabled.
  4. Click Update.
BIG-IP WOM now uses Microsoft Exchange native compression rather than symmetric adaptive compression for MAPI traffic when an optimized application virtual server with which this profile is associated intercepts MAPI traffic.
For this profile to take effect, you must associate it with a virtual server (such as mapi_optimize_client) that is configured to intercept MAPI traffic. To verify this association, view the Application Profile column at WAN Optimization > Optimized Applications.

Enabling automatic discovery of Exchange Servers for MAPI optimization

The system-supplied profile named mapi is configured to optimize MAPI traffic over the WAN through an iSession connection. By default, the BIG-IP WOM system does not discover the Microsoft Exchange Servers automatically, which means that you must configure the virtual servers manually. To set up automatic discovery, modify the MAPI profile, as follows.
  1. On the Main tab, click Local Traffic > Profiles > Services > MAPI. The MAPI profile list screen opens.
  2. Click mapi. Alternatively, you can click Create, and save the new MAPI profile you create with a different name.
  3. For the Discover Exchange Servers setting, select Enabled.
  4. Click Update.
The BIG-IP with WOM system automatically discovers Exchange-based servers for MAPI traffic when an optimized application virtual server with which this profile is associated intercepts MAPI traffic.
For this profile to take effect, you must associate it with a virtual server (such as mapi_optimize_client) that is configured to intercept MAPI traffic. To verify this association, review the Application Profile settings at WAN Optimization > Optimized Applications.
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