In an NSF with SSO design, what happens when the active route processor fails?
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Correct answer: The standby route processor immediately takes control and forwards packets along known routes.
Why this is the answer
Nonstop Forwarding (NSF) with Stateful Switchover (SSO) is a high-availability feature. When the active route processor (RP) fails, the standby RP immediately assumes control. Because SSO maintains the control plane state (like routing tables and forwarding information) on the standby RP, the new active RP can continue forwarding packets using the existing forwarding information base (FIB) without interruption. This ensures continuous data plane operation. The first option is incorrect because the standby RP takes full control, not just temporarily forwards. The second and third options are incorrect because NSF-aware/capable devices are peers that help maintain routing adjacencies during the switchover, but the immediate forwarding action is handled by the newly active RP using its synchronized state, not by an update to the standby RP's RIB at the moment of failure.
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