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A data center administrator is upgrading an ACI fabric. There are 3 APIC controllers in the fabric and all the servers are dual-homed to pairs of leaf switches configured in VPC mode. How should the fabric be upgraded to minimize possible traffic impact during the upgrade?
Correct Answer: C
You need to upgrade the APIC first and group of switches. At a high level, steps to upgrade or downgrade the Cisco ACI fabric are as follows: The procedure or steps for upgrade and downgrade are the same unless stated otherwise in the release notes of a specific release. Ensure that you have the required CIMC version required for Cisco APIC upgrade. See the Cisco APIC Release Notes for the supported CIMC versions and Upgrading the CIMC Software for the procedures for upgrading the CIMC software, if necessary. Download the Cisco ACI Controller image (Cisco APIC image) into the repository. Download the Cisco ACI switch image into the repository. Upgrade the cluster of Application Policy Infrastructure Controllers (Cisco APICs). Verify that the fabric is operational and the APIC cluster is "Fully Fit" before proceeding. Divide the switches into multiple groups, and upgrade the switches by group, verifying that the fabric is operational between switch group upgrades. For example, assume that you divided the switches into two groups - red and blue. You could then go through the following upgrade process: 1. Upgrade the red group of switches. 2. Verify that the fabric is operational. 3. Upgrade the blue group of switches. 4. Verify that the fabric is operational. https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/all/apic-installation- upgrade-downgrade/Cisco-APIC-Installation-Upgrade-Downgrade-Guide/Cisco-APIC-Installation- Upgrade-Downgrade-Guide_chapter_011.html#id_48185