CHAPTER 19: Setting Up a High Availability System426 Vcontrollersite for information on purchasing software upgradelicenses:https://www.watchguard.com/upgradeActive/StandbyActive/Standby means that when a primary appliancefails, the passive appliance comes online with a full copy ofthe state table, to provide maximum uptime and networkavailability.Active/Standby is available for all models that have an HAinterface (this feature is available on the V60L as anoptional upgrade). The license for this feature is providedto you when you register with the LiveSecurity service.Active/ActiveThe Active/Active option works with two Vclass appli-ances paired together using redundant High Availability(HA) Ethernet ports. Active/Active uses transparent statefailover, which provides a seamless transition if one of theboxes fails and the other must take over. System configura-tion, policies and firewall, and VPN connections are sharedbetween the two active appliances, so if one fails, the otheris fully aware of the state of all connections and can con-tinue carrying the load without dropping any packets.Active/Active requires the purchase of a software upgradelicense, and requires V80 or V100 hardware. Please refer tothe WatchGuard Web site for information on purchasingsoftware upgrade licenses:https://www.watchguard.com/upgradeIn this chapterThis chapter discusses High Availability Active/Standby mode.To learn about High Availability Active/Active mode, seethe High Availability Guide that comes with the license keywhen you purchase the HA Active/Active upgrade option.