What does the no-preempt command do in VRRP?

The no-preempt command in Virtual Router Redundancy Protocol (VRRP) is utilized to control the behavior of routers within a VRRP group, specifically relating to which router is designated as the master. When this command is applied, it prevents the primary router, which has the highest priority and would normally take over as master if it comes back online, from preempting the current master router when it fails or goes offline briefly.

This feature is useful in scenarios where stability is more critical than performance. If a backup router has taken over as the master and is functioning adequately, network administrators might prefer it to retain that role without being forcibly replaced by the primary router just because of its higher priority. By employing the no-preempt command, the current master can continue to handle traffic uninterrupted, allowing for a more stable operating environment.

Other choices might suggest actions that are not reflective of the functionality of the no-preempt command, such as allowing a backup router to assume control automatically or affecting the routers' priorities. The essence of the no-preempt command lies in its ability to maintain the current master's status until it fails permanently or is manually intervened upon.