A network engineer is configuring a pair of redundant Layer 3 switches using Virtual Router Redundancy Protocol (VRRP) to provide default gateway high availability for an enterprise VLAN. The design requires that traffic automatically reroutes to the backup switch if the primary switch loses its connection to the core network, and that the primary switch resumes gateway duties once the core link is restored. Which TWO configuration settings must be implemented on the primary switch to meet these requirements? (Select TWO.)
- Interface tracking on the upstream link to decrement the primary router's VRRP priority upon link failureCevap
- Preemption mode enabled on the primary router to reclaim the VRRP master role after recoveryCevap
- CAssigning the physical interface IP address of the primary router as the default gateway on host DHCP scopes
- DSetting the Spanning Tree Protocol (STP) bridge priority on the primary switch to 61440 to enforce primary forwarding
- EConfiguring host network interfaces with the Virtual IP (VIP) as a secondary static IP address
Cevap
The correct implementation requires enabling interface tracking on the upstream link to lower priority during outages, and enabling preemption mode on the primary router so it reclaims the master role upon restoration.
Enabling interface tracking allows VRRP to monitor critical non-VRRP interfaces (such as WAN or core uplinks) and decrement the primary router's priority score if that link fails, prompting the backup router to take over. Enabling preemption ensures that when the tracked uplink recovers and the primary router's priority returns to normal, it reclaims the master gateway role from the backup router.
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First Hop Redundancy Protocol (FHRP) Interface Tracking and Preemption Mechanisms