350-501 Question #322: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. A network engineer must configure XR-PE1 for uninterruptible failover from the active RP to the standby RP. Neither peer device C-GW1 nor the core network of ASN 64512 support grateful restart extensions. Which configuration must the engineer apply to XR-PE1 to complete the task?

Options

• Ansr process-failures switchover
• Brouter bgp 64512 nsr
• Cnsr process-failures switchover
• Dnsr process-failures switchover

Explanation

To achieve uninterruptible failover between active and standby Route Processors (RPs) on XR-PE1, especially without graceful restart support from peers, Non-Stop Routing (NSR) should be configured to trigger a switchover upon process failures.

Common mistakes.

• A. This choice is syntactically identical to choice C, which is the correct answer. The exact distinction in the original question cannot be determined from the provided text.
• B. The command router bgp 64512 nsr would enable NSR specifically for the BGP process, but nsr process-failures switchover is a global NSR command that defines the overall system behavior for RP switchover upon process failures, aligning more broadly with the 'uninterruptible failover' goal.
• D. This choice is syntactically identical to choice C, which is the correct answer. The exact distinction in the original question cannot be determined from the provided text.

Concept tested. Cisco IOS XR Non-Stop Routing (NSR)

Reference. https://www.cisco.com/c/en/us/td/docs/iosxr/asr9000/ha/b-asr9k-ha-cfg-guide/b-asr9k-ha-cfg-guide_chapter_01.html

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