I am new to ACI and would like to study more. When deploying ACI with APIC controller, does it mean all N9K must run in Leaf/Spine L2 loop-free standard and we need to give up Virtual Port-Channel?
Can we skip Leaf-and-Spine but just VPC, STP in the ACI domain? Is Leaf-And-Spine the bread-and-butter for ACI?
Sorry for my fool
In addition to what Mike has already explained, I would suggest reviewing some of the video content is available to you to review. Not knowing where you are in your understanding of ACI, I have included some basic overview video links that you can review. I would suggest reviewing these and then formulate some questions and then we may be able to help you. Also, You always have an option to reach out to your local Account Team and they may also be able to answer some of your questions.
Fundamentals of ACI
Cisco ACI Overview with Soni Jiandani and Joe Onisick
Traffic Flows Through the ACI Fabric
How Devices Connect to the Fabric: Understanding Cisco ACI Domains
ACI on the Cisco Nexus 9000 - Part-1
ACI on the Cisco Nexus 9000 - Part-2