The way this works is two or more routers exchange VRRP messages on a subnet and based on their configuration, decide who is the master and who is the backup. In other words, you can have two routers and if one goes down, the second one kicks in automatically. One of these many things is the Virtual Router Redundancy Protocol, which provides for high availability for IP networking. Keepalived is an open source software project that can do many things related to high availability.
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