Dell SonicWALL SuperMassive 9600 Getting Started Manual

36 | Configuring a Stateful HA PairConfiguring Optional HA SettingsThe following settings are optional. You can configure thesesettings from the High Availability > Settings page.1. To backup the firmware and settings when you upgradethe firmware version, select the Generate/OverwriteBackup Firmware and Settings When UpgradingFirmware checkbox.2. Select the Enable Virtual MAC checkbox to allow thePrimary and Secondary appliances to share a single MACaddress. This greatly simplifies the process of updatingnetwork ARP tables and caches when a failover occurs.Only the WAN switch that the two appliances areconnected to needs to be notified. All outside devices willcontinue to route to the single shared MAC address.3. Click Apply to save any of the settings on this page.Configuring HA Advanced SettingsThe following settings are optional. You can configure thefollowing settings from the High Availability > Advancedpage.1. Adjust the Heartbeat Interval to control how often the twounits communicate. The default and recommendedminimum is 1000 milliseconds.2. The Failover Trigger Level sets the number of heartbeatsthat can be missed before failing over. Dell SonicWALLrecommends leaving this field at its default setting. Thisfield can be tuned later as necessary for your specificnetwork environment.3. Set the Probe Level for the interval in seconds betweencommunication with upstream or downstream systems.Dell SonicWALL recommends that you set the interval forat least 5 seconds. You can set the Probe IP Address(es)on the High Availability > Monitoring screen.4. The Election Delay Time is the number of secondsallowed for internal processing between the two units in theHA pair before one of them takes the primary role.Dell SonicWALL recommends leaving this field at itsdefault setting. This field can be tuned later as necessaryfor your specific network environment.5. Enable the Active / Idle Failover only when ALLaggregate links are down checkbox to treat theaggregated link as down (causing a failover) only if allmember links are down.6. Select the Include Certificates/Keys checkbox to havethe appliances synchronize all certificates and keys.7. Click Synchronize Settings to synchronize the settingsbetween the Primary and Secondary appliances.8. Click Synchronize Firmware if you previously uploadednew firmware to your Primary appliance while theSecondary appliance was offline, and it is now online andready to upgrade to the new firmware.Synchronize Firmware is typically used after taking yourSecondary appliance offline while you test a new firmwareversion on the Primary appliance before upgrading bothappliances to it.9. Click Force Active / Idle Failover to force a failoverbetween your Primary and Secondary appliances.10. Click Accept to retain the settings on this screen.