OCS Exposed – SNAT/DNAT – Load Balancing

April 6, 2008
The load balancer provides scalability and availability across multiple servers that are connected to a centralized database on the OCS Back-End Database. Only one load balancer is required, there can be two logical load balancers—one for the Front End Servers and one for the Web Components Server. Two are recommended for installations using the Enterprise Edition-Expanded configuration.  In OCS, SNAT-Source Network Address translation load balancing is recommended for ease of deployment. Each SNAT IP address on the load balancer limits the maximum number of simultaneous connections to 65,000. DNAT-Destination Network Address translation can also be used for load balancing for the Enterprise user pool.
 
In the second slide – the Table above lists the Port addresses used to configure the LB-Load Balancer. A load balancer is required in an Enterprise pool that has more than one Enterprise Edition Server. Two VIP-Virtual IP addresses are needed for either two logical or separate physical load balancers. When you configure the load balancer, check with the firewall and DNS administrator for at least one VIP-Virtual IP address and FQDN-Fully-Qualified Domain Name for the load balancer (one for each logical load balancer), as well as a static IP address for every server in the Enterprise device pool.
 
If you want to know more, this information is also part of OCS-101 and SIP Essentials 2.0c available in the onsite and online courses. The online version is $299 for SIP 2.0c and for $499 as part of OCS-101 Office Communications Server online version per person or less with discounts. For more information go to http://www.techtionary.com or please call Tom Cross at 303-594-1694 or cross@gocross.com Discounts are also available to members of the SIP Forum. 


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