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350-501 · Question #43

Refer to the exhibit. Which purpose of implementing NSF with this configuration is true?

The correct answer is D. The router uses NSF to handle RP switchover while allowing neighbor relationships to remain up. Nonstop Forwarding (NSF) with a configuration related to RP switchover allows the data plane to continue forwarding traffic while the control plane performs a switchover, maintaining neighbor relationships.

Networking

Question

Refer to the exhibit. Which purpose of implementing NSF with this configuration is true?

Options

  • AThe router uses NSF to load balance traffic between two links, with the primary link alternating
  • BThe router uses NSF to reduce neighbor-relationship downtime during RP switchover
  • CThe router uses NSF to load balance traffic on a routed EtherChannel
  • DThe router uses NSF to handle RP switchover while allowing neighbor relationships to remain up

How the community answered

(32 responses)
  • A
    3% (1)
  • C
    3% (1)
  • D
    94% (30)

Why each option

Nonstop Forwarding (NSF) with a configuration related to RP switchover allows the data plane to continue forwarding traffic while the control plane performs a switchover, maintaining neighbor relationships.

AThe router uses NSF to load balance traffic between two links, with the primary link alternating

NSF is a high-availability feature for control plane resilience, not for load balancing traffic.

BThe router uses NSF to reduce neighbor-relationship downtime during RP switchover

While NSF contributes to maintaining neighbor relationships, its primary purpose is broader-to allow forwarding during control plane events, not just reducing downtime, and it allows relationships to *remain up* rather than reducing downtime.

CThe router uses NSF to load balance traffic on a routed EtherChannel

NSF is not used for load balancing traffic on a routed EtherChannel; EtherChannel load balancing is a separate feature based on hashing algorithms.

DThe router uses NSF to handle RP switchover while allowing neighbor relationships to remain upCorrect

NSF enables a router to continue forwarding IP packets even when its Routing Processor (RP) is unavailable or undergoing a switchover to a standby RP. This process leverages graceful restart capabilities to maintain neighbor adjacencies and forwarding information, ensuring continuous data plane operation.

Concept tested: Nonstop Forwarding (NSF) purpose

Source: https://www.cisco.com/c/en/us/td/docs/ios/iproute_bgp/configuration/guide/irg_nsf_ss_support_on_ios_xe.html

Topics

#Nonstop Forwarding (NSF)#High Availability#Route Processor Redundancy#Control Plane Resiliency

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