--> APIC uses IFM Messages to communicate to SPINE/LEAF/Other APIC Controllers.
--> Fabric discovery happens in three stages.
1) The leaf Switch which is directly connected to the APIC is discovered
2) The leaf Switch then Discovers the spine switches
3) The Discovery of other Leaf Switches and APIC Controllers
--> As Soon As APIC Initiliaztion is completed then APIC starts sending LLDP Packets to the Fabric Ports where Leaf Switches are connected.
--> LLDP Packets contains the Information about Infrastructure VLAN and APIC Controller Information.
--> After Receiving the LLDP Packets from APIC, Leaf Switch will configure the Ports in Infra VLAN where LLDP Packets are received.
--> The Leaf Switch now starts sending DHCP Discover Packets in the Infra VLAN to get the IP address.
--> DHCP Offer is not sent to the Leaf Switch until it is registered (Node ID/Name) from APIC GUI by the Admin.
--> As soon as The Leaf Switch is added to the Fabric from GUI, APIC will send DHCP Offer to the Leaf Switch.
--> Other Leaf Switches and SPINE Switches follow the same process as above.
--> Leaf and Spine Switches now form ISIS Adjacency between them.
--> After Adjacency, The Certificate Validation takes place between APIC and other Nodes.
--> Now ACI uses IFM Messages to Communicate Leaf/SPINE Switches.
--> The last step is to push the Policy by using IFM Messages.
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