Broadcom-VMware
3V0-25.25 · Question #56
A workload domain uses Active-Standby Tier-0 with a single Edge cluster. After a failover event, north-south traffic resumes, but ARP entries on upstream switches remain incorrect, causing…
The correct answer is B. Gratuitous ARP. After a Tier-0 Active-Standby failover, the new active Edge node sends Gratuitous ARP to update upstream devices with the correct MAC-to-IP mappings. BFD handles failure detection, not neighbor update. This exact ARP-vs-BFD distinction shows up a lot in advanced NSX exams.
Troubleshoot NSX-T Data Center Networking
Question
A workload domain uses Active-Standby Tier-0 with a single Edge cluster. After a failover event, north-south traffic resumes, but ARP entries on upstream switches remain incorrect, causing intermittent packet loss. Which NSX mechanism is responsible for correcting this condition?
Options
- ABFD
- BGratuitous ARP
- CRoute redistribution
- DMAC address table aging
How the community answered
(41 responses)- A5% (2)
- B83% (34)
- C2% (1)
- D10% (4)
Explanation
After a Tier-0 Active-Standby failover, the new active Edge node sends Gratuitous ARP to update upstream devices with the correct MAC-to-IP mappings. BFD handles failure detection, not neighbor update. This exact ARP-vs-BFD distinction shows up a lot in advanced NSX exams.
Topics
#Gratuitous ARP#ARP table correction#Active-Standby Tier-0#failover
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