McAfee SG310 Administration Manual page 75

Network Setup menu options
High Availability
It is also possible to switch multiple network interfaces with high availability. In this case, one of the
interfaces is designated as the checking interface. You can specify additional interfaces that are also
switched. When the appliance becomes primary, all specified interfaces will have the appropriate shared IP
address assigned. When the appliance becomes secondary, all specified interfaces will have the shared IP
address removed.
The following diagrams illustrate the basic HA configuration.
Figure 75 Basic HA configuration
In the scenario illustrated in Figure 75, UTM Firewall appliance #1 is initially the primary appliance and
therefore the default gateway for the local network. UTM Firewall appliance #2 is the secondary appliance
on standby. The standby status could be due to UTM Firewall appliance #1 booting up before UTM Firewall
appliance #2, or UTM Firewall appliance #2 might have previously failed but has come back online.
McAfee UTM Firewall 4.0.4 Administration Guide 75