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Page 32 Configuring a State Sync Pair in NAT/Route Mode
Adjusting High Availability Settings
On the High Availability > Settings page, there are four user-
configurable timers that can be adjusted to suit your network’s
needs:
• Heartbeat Interval (seconds) – This timer is the length of
time between status checks. By default this timer is set to 5
seconds; using a longer interval will result in the
SonicWALL taking more time to detect when/if failures
have occurred.
• Failover Trigger Level (missed heartbeats) – This timer
is the number of heartbeats the SonicWALL will miss
before failing over. By default, this time is set to 5 missed
heartbeats.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.
• Probe Interval – This timer controls the path monitoring
speed. Path monitoring sends pings to specified IP
addresses to monitor that the network critical path is still
reachable. The default is 20 seconds, and the allowed
range is from 5 to 255 seconds.
• 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.
Synchronizing Firmware
Checking the Synchronize Firmware Upload and Reboot
checkbox allows the Primary and Backup SonicWALL security
appliances in HA mode to have firmware uploaded on both
devices at once, in staggered sequence to ensure security is
always maintained. During the firmware upload and reboot, you
are notified via a message dialog box that the firmware is
loaded on the Backup SonicWALL security appliance, and then
the Primary SonicWALL security appliance. You initiate this
process by clicking on the Synchronize Firmware button.