350-401 · Question #657
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 Ed
The correct answer is A. Edge-01(config)#interface G0/1. 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.
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?
Exhibits
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
How the community answered
(32 responses)- A81% (26)
- B6% (2)
- C9% (3)
- D3% (1)
Why each option
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.
This command set configures Edge-01 to have a VRRP priority of 105 and tracks object 1 (representing interface G0/0 on Edge-01) with a decrement of 15. If G0/0 fails, Edge-01's priority will drop from 105 to 90, making it lower than Edge-02's default priority of 100, which then allows Edge-02 to preempt and become the VRRP master.
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.
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.
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
Source: 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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