A network engineer needs to configure a high availability feature for a data center that uses a Cisco Nexus 7700 Series Switch that is configured with dual supervisors. The feature must meet these req

Graceful Restart (GR) is a mechanism that allows a routing device, even with dual supervisors, to signal to its neighbors that it is undergoing a control plane restart while its data forwarding plane remains operational. Neighbors, upon receiving this signal, temporarily retain their routing entries for the restarting device, ensuring that traffic continues to flow to its peers during the adjacency re-establishment process, thus maintaining network resilience and reducing instability.

BFD (Bidirectional Forwarding Detection) is a fast failure detection protocol for links and neighbors; it enhances resilience by quickly detecting outages but does not address the scenario of maintaining traffic forwarding during a control plane restart with neighbor notification.

NSF (Nonstop Forwarding) allows the data plane to continue forwarding traffic using old routing information even if the control plane fails or restarts, but it's the underlying forwarding capability; Graceful Restart is the protocol mechanism that enables this with neighbors.

NSR (Nonstop Routing) provides even higher availability by perfectly synchronizing the control plane state to a standby supervisor, preventing any loss of routing adjacency or state during a supervisor switchover, which is different from notifying neighbors and re-establishing relationships during a restart.