HA does not support Portshield interfaces and Native Bridge mode. If you are connecting the Primary and Backup appliances to an Ethernet switch that uses the spanning tree protocol, please be aware that it may be necessary to adjust the link activation time on the switch port that the SonicWall interfaces connect to.
Before following this guide, please disable the PortShield and Native Bridge mode on both primary and secondary appliances: How to disable PortShield. If the secondary contains any configuration, please do a factory reset: Reset the firewall to factory default settings when the firewall is accessible and after the reset, disable the PortShield. Once you configure High Availability on the Primary SonicWall security appliance, you push out the settings to the Backup SonicWall security appliance. Now, the Primary appliance should find the secondary and start to synchronize firmware if different and settings with the secondary.
If not, please make sure that. This feature controls the behavior in which the Primary unit will seize the Active role from the Backup after it recovers from an error condition, reboot or firmware upgrade, after it successfully communicates to the backup unit that it is in a verified operational state.
Preempt mode is not recommended when enabling Stateful High Availability, because preempt mode forces additonal synchronizations of traffic, which is not recommended on high load networks. Configuring Advanced High Availability Settings. When Stateful High Availability is not enabled, session state is not synchronized between the Primary and Backup SonicWall security appliances. If a failover occurs, any session that had been active at the time of failover needs to be renegotiated. Failover Trigger Level missed heart beats This timer is the number of heartbeats the SonicWall will miss before failing over.
By default, this time is set to 5 missed heart beats. This timer is linked to the Heartbeat Interval timer for example, if you set the Heartbeat Interval to 10 seconds, and the Failover Trigger Level timer to 5, it will be 50 seconds before the SonicWall fails over. Election Delay Time This timer can be used to specify an amount of time the SonicWall will wait to consider an interface up and stable, and is useful when dealing with switch ports that have a spanning-tree delay set. Configuring High Availability Monitoring settings On the High Availability Monitoring page, you can configure unique management IP addresses for both units in the HA Pair which allows you to log in to each unit independently for management purposes: Configuring High Availability Monitoring settings.
The Monitoring IP is the one used by the Standby appliance to download licensing information.
Successful High Availability synchronization is not logged, only failures are logged. Tips for High Availability HA setup. Blog Contact Sales Free Trials.
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- What is a Stateful High Availability?.
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- Configuring High Availability Monitoring settings.
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Security Center. Technology Partners Learn about SonicWall technology and alliance partners. Search for: Knowledge Base. The dedicated HA interfaces are connected directly to each other using a crossover cable.
What is a Stateful High Availability? | SonicWall
Resolution TIP: Login to the SonicWall Management Interface. Click Manage in the top navigation menu.
The General tab is displayed. Fields are displayed with recommended settings for the Heartbeat Interval and Probe Interval fields.
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- Tips for High Availability (HA) setup.
The settings shown are minimum recommended values. When Stateful High Availability is not enabled, session state is not synchronized between the Primary and Secondary firewalls.
How to Configure High Availability (HA)
If a failover occurs, any session that had been active at the time of failover needs to be renegotiated. To configure the High Availability Pair so that the Primary unit takes back the Primary role once it restarts after a failure, select Enable Preempt Mode. Preempt mode is recommended to be disabled when enabling Stateful High Availability, because preempt mode can be over-aggressive about failing over to the Secondary appliance. This greatly simplifies the process of updating network ARP tables and caches when a failover occurs.
Only the switch to which the two appliances are connected needs to be notified.