300-615 DCIT: Troubleshooting Cisco Data Center Infrastructure

By Cisco · Question Mode

QuestionQ5

Management and Operations

A Cisco ACI environment includes three Cisco APICs, two spine switches, and four leaf switches. An engineer erases and reboots all APICs first, then erases and reboots the leaf and spine switches individually, and completes the Initial Setup dialog from the APIC1 CIMC KVM console. After logging in to the APIC1 web GUI, the engineer finds that no directly connected leaf switches are being discovered under Fabric > Inventory > Fabric Membership. What is causing the issue?

Explanation

A clean-reloaded leaf can receive stale infrastructure fabric parameters through LLDP from a switch that has not yet been cleaned. Those mismatched parameters prevent the leaf from registering or appearing in fabric membership. Cisco documents that all leaf switches must be clean rebooted simultaneously when infrastructure parameters change; otherwise a clean-reloaded leaf can learn the old infrastructure VLAN and fail to register with the APIC.

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