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SonicOS 5.8.1 Administrator Guide
Configuring High Availability in SonicOS
To configure High Availability, you must configure High Availability in the SonicOS management
interface using the two SonicWALL appliances associated on MySonicWALL. For information
about associating two appliances, see “Associating Appliances on MySonicWALL for High
Availability” on page 1145.
Before configuring Active/Active DPI, you must configure two SonicWALL security appliances
as a Stateful High Availability pair and enable Stateful Synchronization in the SonicOS
management interface.
On SonicWALL appliances that support the PortShield feature (SonicWALL TZ series and NSA
240), High Availability can only be enabled if PortShield is disabled on all interfaces of both the
Primary and Backup appliances.
You can disable PortShield either by using the PortShield Wizard, or manually from the
Network > PortShield Groups page.
Refer to the following sections:
• “Disabling PortShield with the PortShield Wizard” on page 1155
• “Disabling PortShield Manually” on page 1156
• “High Availability > Settings” on page 1157
• “High Availability > Advanced Settings” on page 1159
• “High Availability > Monitoring” on page 1161
• “Synchronizing Settings and Verifying Connectivity” on page 1163
• “Forcing Transitions” on page 1164