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Architecture: 
BlackBerry 2FA
 high availability

BlackBerry 2FA
 supports active-active high availability. You can install multiple instances of the 
BlackBerry 2FA
 server to provide load-balancing for authentication requests and to promote reliability. 
The following diagram shows a high availability scenario. Some VPN solutions might include a load balancer, and in that scenario a separate load balancer is not required.
 
This diagram shows VPN Authentication by BlackBerry configured for high availability.