350-501 Question #294: Real Exam Question with Answer & Explanation

Question

An engineer Is implementing NSR with OSPF on a large campus that requires high availability. Which task must an engineer perform to complete the process with minimal disruption to traffic?

Options

• AReset OSPF neighbour sessions to maintain state Information during router switchover
• BConfigure the device to repopulate state information using routing updates received from the BDR
• Cincrease the keepalive interval on the OSPF neighbours so that traffic continues to pass during
• DEnsure that the dual HP has synchronized their state information before performing the

Explanation

To implement OSPF NSR with minimal traffic disruption, the active and standby route processors must synchronize their state information before any switchover occurs, ensuring continuous forwarding during a failover event.

Common mistakes.

• A. Resetting OSPF neighbor sessions would disrupt traffic and goes against the goal of NSR, which is to maintain session state.
• B. Repopulating state information from BDR updates implies a loss of state and a reconvergence, which would cause disruption, contrary to NSR's purpose.
• C. Increasing keepalive intervals might delay detection of a peer failure but does not ensure state preservation or prevent traffic disruption during a local router's processor switchover.

Concept tested. OSPF Non-Stop Routing (NSR) synchronization

Reference. https://www.cisco.com/c/en/us/td/docs/ios/ios_xe/nsv/configuration/guide/nsf_nsv_xe_cfg.html

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