Initial APIC Cluster Discovery Process
Question
Which description regarding the initial APIC cluster discovery process is true?
Answers
Explanations
Click on the arrows to vote for the correct answer
A. B. C. D.C.
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/1-x/aci-fundamentals/b_ACI-Fundamentals/b_ACI-The initial APIC cluster discovery process is the process by which the first APIC controller in a new ACI fabric discovers and communicates with the other controllers and network devices in the fabric. This is a critical step in the ACI deployment process, as it establishes the foundation for the fabric's operation and management.
Regarding the given answer choices:
A. The APIC uses an internal IP address from a pool to communicate with the nodes. This statement is not entirely accurate. The APICs do use internal IP addresses to communicate with each other and with other devices in the fabric, but these addresses are not necessarily drawn from a pool. Instead, each APIC has a pre-configured IP address that is used for inter-APIC communication.
B. Every switch is assigned a unique AV by the API. This statement is also not correct. In the context of ACI, an "AV" refers to an "attachment virtualization identifier," which is a unique identifier assigned to each endpoint in the fabric. Switches do not receive AVs - these are only assigned to endpoints like servers or virtual machines.
C. The APIC discovers the IP address of the other APIC controllers by using Cisco Discovery Protocol. This statement is also incorrect. The APICs do not use Cisco Discovery Protocol (CDP) to discover each other in an ACI fabric. Instead, they use a proprietary protocol called the "fabric discovery protocol" (FDP), which is specifically designed for ACI fabrics.
D. The ACI fabric is discovered starting with the spine switches. This statement is true. When a new ACI fabric is first deployed, the initial APIC controller will typically connect to one or more spine switches in the fabric. The APIC will then use the FDP to discover and communicate with the other devices in the fabric, starting with the spine switches and working its way down to the leaf switches, endpoints, and other network devices. This discovery process is critical for establishing the fabric's topology, capabilities, and policies.
