350-401 Question #657: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. Object tracking has been configured for VRRP-enabled routers Edge-01 and Edge-02. Which commands cause Edge-02 to preempt Edge-01 in the event that interface G0/0 goes down on Edge-01?

Options

• AEdge-01(config)#interface G0/1
• BEdge-02(config)#interface G0/1
• CEdge-02(config)#interface G0/1
• DEdge-01(config)#interface G0/1

Explanation

To enable Edge-02 to preempt Edge-01 when G0/0 on Edge-01 fails, Edge-01 must have its VRRP priority initially set higher and then configured to decrement significantly upon G0/0 interface failure.

Common mistakes.

• B. Configuring Edge-02 with a priority and tracking an object to decrement its own priority would not cause Edge-02 to preempt Edge-01 when Edge-01's G0/0 goes down; it affects Edge-02's mastership based on its own interface status.
• C. Similar to B, configuring Edge-02's priority and tracking an object on Edge-02 itself does not address the scenario of Edge-01's G0/0 failure causing Edge-02 to preempt.
• D. While this configures Edge-01, a decrement of 5 from priority 105 results in 100, which would not guarantee preemption by Edge-02 if Edge-02's priority is also 100, as the master determination would then fall to the tie-breaking rule of higher IP address.

Concept tested. VRRP object tracking and preemption

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp_fhrp/configuration/15-mt/fhrp-15-mt-book/fhrp-vrrp.html

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