Transmission Method for Sending ARP Requests in Cisco ACI Fabric
Question
A host that is connected to a Cisco ACI fabric leaf switch sends an ARP request.
Which transmission method does the ingress switch use to send the ARP requests?
Answers
Explanations
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A. B. C. D.D.
https://www.cisco.com/c/en/us/td/docs/dcn/whitepapers/cisco-application-centric-infrastructure-design-guide.htmlWhen a host connected to a Cisco ACI fabric leaf switch sends an ARP request, the ingress switch uses a multicast transmission method to send the ARP requests.
In the ACI fabric, a MAC address is associated with a particular endpoint, and this mapping is maintained by the spine and leaf switches. When a host sends an ARP request, it is looking for the MAC address of the destination IP address. Since the MAC address is associated with a particular endpoint in the ACI fabric, the switch needs to send the ARP request to all the leaf switches in the fabric to find out the endpoint to which the destination IP address is associated.
To achieve this, the ingress switch uses multicast transmission to send the ARP request to all the leaf switches in the fabric. In a multicast transmission, a single packet is sent to a group of devices that have expressed interest in receiving the packet. In the case of the ACI fabric, all the leaf switches are members of the multicast group, and they all receive the ARP request.
The multicast transmission method is used in the ACI fabric to reduce the amount of traffic sent over the fabric. If a broadcast transmission method were used, the ARP request would be sent to all devices in the fabric, causing unnecessary traffic and potentially impacting the performance of the network.
Therefore, the correct answer is C. multicast.
