The Palo Alto Networks onsite spares program is an optional extension of the Premium Support program that provides customers with another level of reliability that complements the active/passive high availability and next-day hardware replacement. The onsite spare is the same platform model as the production unit, but without any software (threat prevention, URL filtering) or support licensing. If a critical failure occurs, your existing licenses are transferred to the onsite spare, allowing your team to quickly restore traffic by replacing the disabled down firewall with the onsite spare. Once traffic is restored, the cause of the problem in the failed device can be determined and addressed with the support team without impacting the business.