350-401 · Question #540
An engineer configures GigabitEthernet 0/1 for VRRP group 115. The router must assume the primary role when it has the highest priority in the group. Which command set is required to complete this tas
The correct answer is B. Router(config-if)# vrrp 115 track 1 decrement 10. To dynamically manage a VRRP router's priority based on its operational status and ensure primary role is assumed only when healthy, the vrrp track command is used. This command decreases the router's priority if a monitored object fails, allowing a backup to take over.
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Options
- ARouter(config if)# vrrp 115 track 1 decrement 100
- BRouter(config-if)# vrrp 115 track 1 decrement 10
- CRouter(config-if)# standby 115 priority 100
- DRouter(config-if)# vrrp 115 priority 100
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Why each option
To dynamically manage a VRRP router's priority based on its operational status and ensure primary role is assumed only when healthy, the `vrrp track` command is used. This command decreases the router's priority if a monitored object fails, allowing a backup to take over.
While `vrrp track` is the correct mechanism, a decrement of 100 is typically an overly aggressive priority drop for common VRRP configurations, whereas 10 is a frequently used and effective value for graceful failover with default or slightly elevated priorities.
The `vrrp 115 track 1 decrement 10` command configures VRRP to monitor a specified object (like an interface or route) and automatically decrement its priority by 10 if that object fails. This ensures that the router will relinquish its primary role if its critical components are not operational, allowing another router with a higher effective priority to assume the primary role.
The `standby` keyword is used for HSRP (Hot Standby Router Protocol), not for VRRP (Virtual Router Redundancy Protocol); VRRP commands begin with `vrrp`.
`vrrp 115 priority 100` sets a static priority, which is the default and does not provide the dynamic adjustment necessary to ensure the router assumes the primary role only under varying operational conditions based on its health.
Concept tested: VRRP priority tracking for dynamic failover
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp_fmc/configuration/xe-16-10/fmc-xe-16-10-book/fmc-vrrp.html
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