To register the switch into the fabric you have to specify some information:
Pod ID: The number of the POD the switch will be part of. Defaults to 1 and only needs to be changed in the case of a multi-pod environment.
Node ID: A unique number specifying the node. This number can be anything between 101 and 4000. It is recommended to have a numbering scheme for Spine and leaf switches. For example 101 - 199 for Spine switches, and 201 - 299 for Leaf switches. The numbers don’t have to be consecutive.
Node Name: The human readable identifier of the switch. I would recommend to include the node number in the name, but this is not required.
Role: The role of the switch. This can be:
-Spine
-Leaf
-Virtual Leaf
-Virtual Spine
-Remote Leaf
-Tier 2 Leaf (as of version 4.1)
Rack name: Optional information about the location of the switch.
As soon as you’ve registered the first leaf switch it will assigned an IP address by the APIC. After a basic configuration by the APIC it can be used to continue the discovery. The leaf switch will detect its connected spines and those will detect the leaf switches after they’ve been registered.
Refer to:https://www.mvankleij.nl/post/aci_fabric_discovery/
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