Step 1. Download the ACI Controller image (APIC image) into the repository.
Step 2. Download the ACI switch image into the repository.
Step 3. Upgrade the ACI controller cluster (APICs).
Step 4. Verify the fabric is operational.
Step 5. Divide the switches into multiple groups (for example, divide them into two groups: red and blue).
Step 6. Upgrade the red group of switches.
Step 7. Verify the fabric is operational.
Step 8. Upgrade the blue group of switches.
Step 9. Verify the fabric is operational.
Additionally, here are some general guidelines regarding ACI fabric upgrade/downgrade:
Divide switches into two or more groups. Upgrade one group at a time. That way, you will maintain connectivity for your redundant servers and not lose fabric bandwidth entirely during the upgrade window.
Do not upgrade or downgrade nodes that are part of a disabled configuration zone. Unless specified otherwise in release notes of a specific release, you can upgrade (or downgrade) controllers before switches, and vice versa (switches before controllers). A specific release, or a combination of releases, may have some limitations and recommendations for the upgrade or downgrade procedure. Double-check the release notes for the release before upgrading or downgrading your ACI fabric.
If no such limitations or recommendations are specified in the release notes, the aforementioned steps should be followed to upgrade or downgrade your ACI fabric.
Reference: Deploying ACI: The complete guide to planning, configuring, and managing Application Centric Infrastructure
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