A system administrator checks the endpoint database and discovers MAC addresses that belong to inactive local nodes. Which description of the retention of the MAC addresses for the local nodes is true?
A. After five minutes, the inactive nodes are removed from the local endpoint database of the leaf.
B. The local database if cleared only when the leaf reboots.
C. The leaf sends three ARP requests after an aging period. The MAC addresses are stored to the local endpoint database as long as the devices respond to the requests
D. After 15 minutes, the inactive nodes are removed from the local endpoint database of the leaf.
The answer is C.
Before removing an inactive entry, the leaf switch sends three ARP requests to the endpoint to see if it really has gone away. If the switch receives no ARP response, the entry is pruned.
Answer is C.
The default value for the local retention timer is 15 minutes. BEFORE REMOVING an inactive entry, the leaf switch sends three ARP requests to the endpoint to see if it really has gone away.
Correct answer is D. 15 minutes for LOCAL nodes
Software that runs on the leaf switch actively manages these tables. For the locally attached endpoints, the software ages out entries after a retention timer for each entry has expired. Endpoint entries are pruned from the switch cache as the endpoint activity ceases, the endpoint location moves to another switch, or the life cycle state changes to offline. The default value for the local retention timer is 15 minutes. Before removing an inactive entry, the leaf switch sends three ARP requests to the endpoint to see if it really has gone away. If the switch receives no ARP response, the entry is pruned. For remotely attached endpoints, the switch ages out the entries after five minutes of inactivity. The remote endpoint is immediately reentered in the table if it becomes active again.
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/1-x/aci-fundamentals/b_ACI-Fundamentals/b_ACI-Fundamentals_chapter_010010.html