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300-170 · Question #4

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…

The correct answer is A. After five minutes, the inactive nodes are removed from the local endpoint database of the leaf. This question asks about the default aging time for inactive MAC addresses in the local endpoint database of a Cisco ACI leaf switch.

Cisco Data Center Virtualization

Question

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?

Options

  • AAfter five minutes, the inactive nodes are removed from the local endpoint database of the leaf
  • BThe local database is cleared only when the leaf reboots
  • CThe leaf sends three ARP requests after an aging period. The MAC addresses are stored to the
  • DAfter 15 minutes, the inactive nodes are removed from the local endpoint database of the leaf

How the community answered

(67 responses)
  • A
    90% (60)
  • B
    1% (1)
  • C
    7% (5)
  • D
    1% (1)

Why each option

This question asks about the default aging time for inactive MAC addresses in the local endpoint database of a Cisco ACI leaf switch.

AAfter five minutes, the inactive nodes are removed from the local endpoint database of the leafCorrect

Cisco ACI leaf switches typically age out inactive MAC addresses from their local endpoint database after a default period of 5 minutes to maintain an accurate and up-to-date forwarding table. This mechanism ensures that stale entries for hosts that have moved or become inactive are removed promptly.

BThe local database is cleared only when the leaf reboots

The local endpoint database is not solely cleared upon a leaf reboot; MAC addresses also age out dynamically based on inactivity timers.

CThe leaf sends three ARP requests after an aging period. The MAC addresses are stored to the

While ARP requests are part of endpoint learning and validation, the primary mechanism for removing inactive local nodes after an aging period is through timer expiration, not necessarily initiated by ARP requests for removal.

DAfter 15 minutes, the inactive nodes are removed from the local endpoint database of the leaf

15 minutes is not the default aging time for inactive local MAC addresses on a Cisco ACI leaf switch; the standard default is 5 minutes.

Concept tested: ACI endpoint aging policy

Source: https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-739311.html

Topics

#ACI Endpoint learning#MAC address aging#Leaf switch#Endpoint database

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