300-620 · Question #215
In a Cisco ACI fabric, an endpoint moves between two leaf switches during a virtual machine migration. Which action does Cisco ACI take to minimize the impact to traffic during this event?
The correct answer is A. A new leaf switch updates a COOP database on the spine, which causes the old leaf switch to. When an endpoint moves between leaf switches during a VM migration, Cisco ACI uses the COOP protocol on the spine switches to rapidly update its location and minimize traffic disruption.
Question
In a Cisco ACI fabric, an endpoint moves between two leaf switches during a virtual machine migration. Which action does Cisco ACI take to minimize the impact to traffic during this event?
Options
- AA new leaf switch updates a COOP database on the spine, which causes the old leaf switch to
- BA new leaf switch sends a COOP message to the Cisco APIC cluster to populate a new location
- CA new leaf switch sends a COOP message directly to the old leaf switch to update it with new
- DA new leaf switch floods GARP to every other leaf switch in the fabric, which advertises a new
How the community answered
(48 responses)- A90% (43)
- B2% (1)
- C4% (2)
- D4% (2)
Why each option
When an endpoint moves between leaf switches during a VM migration, Cisco ACI uses the COOP protocol on the spine switches to rapidly update its location and minimize traffic disruption.
When an endpoint moves, the new leaf switch learns its location and sends a COOP message to the spine switches. The spine switches, acting as a distributed database, update the COOP database with the new location and notify other relevant leaf switches, including the old one, about the endpoint's new path, ensuring rapid network convergence.
COOP messages are primarily exchanged between leaf and spine switches for endpoint learning and distribution, not directly to the APIC cluster for real-time endpoint location population.
COOP messages for endpoint moves are not sent directly between the new and old leaf switches; they are mediated by the spine switches that maintain the COOP database.
Cisco ACI uses its distributed control plane (COOP) for efficient endpoint mobility rather than relying on flooding GARP messages across all leaf switches in the fabric.
Concept tested: Cisco ACI endpoint mobility and COOP protocol
Source: https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-731301.html
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