The load balancer performs the critical role of
delivering scalability and high availability across
multiple servers connected to a centralized database on
the Office Communications Server, Back-End Database
server or web component servers.
Note: You
don't need a Load Balancer if you have only one Access
Edge Server.
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Required Ports on the Load Balancer Virtual IP
Address |

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Important links for the NLB |
Network Load Balancer technical overview