350-501 · Question #294
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?
The correct answer is D. Ensure that the dual HP has synchronized their state information before performing the. 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.
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
How the community answered
(38 responses)- B3% (1)
- C5% (2)
- D92% (35)
Why each option
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.
Resetting OSPF neighbor sessions would disrupt traffic and goes against the goal of NSR, which is to maintain session state.
Repopulating state information from BDR updates implies a loss of state and a reconvergence, which would cause disruption, contrary to NSR's purpose.
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.
Non-Stop Routing (NSR) relies on the synchronization of routing and forwarding state information between redundant route processors (like dual HPs). This pre-synchronization ensures that when a switchover occurs, the newly active processor already possesses all necessary state to continue routing without interruption.
Concept tested: OSPF Non-Stop Routing (NSR) synchronization
Source: https://www.cisco.com/c/en/us/td/docs/ios/ios_xe/nsv/configuration/guide/nsf_nsv_xe_cfg.html
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