• Secure Mobile Access 12.4
• About This Guide
• CMS Configuration
  • Introduction to CMS
    • Overview
    • CMS Deployment Options
    • What’s New in This Release
      • Global Policy Settings
      • CMS Alerts Logging
    • Central Management Server
    • Central Management Console
    • Managed Appliances
    • Licensing CMS
    • Central User Licenses
    • Global Traffic Optimizer
    • FIPS and CMS
    • Getting Started in Five Steps
  • Installing and Configuring the Central Management Server
    • Overview
    • Kernel based Virtual Machine
    • Supported Platforms for CMS with Global HA
    • Hardware Resource Requirements
    • Installation Files
    • Setting Up a CMS
  • Configuring Appliances for Central Management
    • Overview
    • Firmware Compatibility with the CMS
    • Enabling Central Management on SMA Appliance
    • Registering an SMA Appliance with the CMS
    • Previously Configured Appliances
  • Using the Management Console Menus
    • Overview
    • Dashboard
      • Alerts
      • Appliances Pane
      • Appliance Load
      • Central License Usage Pane
      • About Pane
    • Management Server
      • Alerts
        • View Alerts
        • Configure Alerts
        • Notification
      • Configure
        • Central Management Settings
        • CMS Address Pool
        • Licensing
        • Administrators
          • General Settings
        • Network Settings
        • SSL Settings
        • Services
          • Manage SSH settings from CMS
      • Monitor
        • Configure the logging setting for Managed appliances
      • Maintain
    • Managed Appliances
      • Add/Remove
      • Configure
        • Overview
        • Configuring the Managed Appliances
          • Define Policy
          • Synchronize
        • Support multiple policies with CMS and shared licensing
          • Applying authentication servers to specific appliance
          • Applying SMTP configuration service to specific appliance
          • Applying SMS service to specific appliance
          • Applying realms to a subset of appliance
          • Assign rules to a subset of appliances
          • Support multiple GTO services
      • Monitor
        • User Sessions
        • Reports
        • Health
      • Maintain
  • Central User Licensing
    • Overview
    • How Central User Licenses Work
      • Central Spike User Licenses
      • Central Email Licenses
      • Perpetual Pooled Licenses
    • Enabling Central User Licensing
    • Getting Started with Central User Licensing
      • Setting Up CMS to Use Central User Licenses
      • Setting up CMS for Centralized Appliance Configuration and Management
      • Resetting a CMS License
  • Global High Availability
    • High Availability of the VPN Service
    • High Availability of the CMS
    • Disaster Recovery for the VPN Service
  • Alerts and SNMP
    • Overview
    • Pre-Configured Alerts
    • Configuring SNMP
  • Capture Advanced Threat Protection
    • Enabling Capture ATP
    • File Options
    • Web Services
    • Advanced Settings
  • Central FIPS Licensing
• Global High Availablity
  • Introduction to Global HA and GTO
  • Planning GTO Deployment
    • Choosing a Deployment Model
    • Minimizing Configuration Differences
    • GTO Service Names and DNS Delegations
    • Provisioning Certificates
      • Let's Encrypt
      • Adding Certificates to SMA Appliances
      • Generating a Certificate Signing Request (CSR)
      • Importing SSL Certificates
  • Setting up GTO
    • Setting up the CMS and SMA appliances
    • Enabling GTO service for managed appliances with the CMS
    • Setting up a Basic GTO Service
    • Monitoring and Configuring GTO
    • Defining the Central Policy
  • Extending GTO Deployment
    • Enabling Cached Credentials
    • Additional Deployment Notes
• SonicWall Support
  • About This Document

High Availability of the VPN Service

Global High Availability (Global HA) is configured from the CMS console by first enabling the Global Traffic Optimizer (GTO) service. Users access the VPN using the service name (e.g. access.example.com) in the VPN tunnel clients (Connect Tunnel or Mobile Connect) or the web client. The GTO service directs user connections to an appliance that is available.

Global HA enables SMA appliances to scale performance by deploying multiple appliances under a service name. Global HA eliminates a single point of failure and provides a highly available global VPN service. Customers can deploy 2 SMA appliances in the same data center or across multiple data centers around the globe.

A distributed data store shares user session state as well as licensing information across the mesh network of SMA appliances. This allows for session persistence across appliances. In the event of a failover, users are connected to another appliance in the service. The distributed data store also allows for central user licenses to be shared across appliances and data centers.

All of the SMA appliances that are configured for the GTO service participate in the highly available VPN service. If an appliance that is part of the service fails due to hardware, power, or network issues:

• New connection requests (by tunnel or web clients) will get directed to other available appliances.
• Existing connections (that were connected to the appliance that failed) are automatically reconnected to another available appliance. Users typically do not need to re-enter their credentials.