Sunday, 24 August 2025

Common Causes of "Unknown" Leaf State

 

 Common Causes of "Unknown" Leaf State

  • Certificate Issues: The leaf might not be presenting a valid certificate chain to the APIC, which prevents proper SSL handshake and authentication.

  • LLDP Mismatch or Failure: ACI relies on LLDP (Link Layer Discovery Protocol) for fabric discovery. If LLDP info isn’t exchanged correctly between APIC and leaf, discovery fails.

  • Firmware Incompatibility: The leaf switch might be running a version of ACI software that’s not compatible with the APIC or spine switches.

  • Hardware Problems: Faulty transceivers, cables, or ports can block communication between APIC and leaf.

  • Time Sync Issues: If the leaf’s system time is out of sync with the APIC, certificate validation may fail.

  • Incorrect Node ID or Serial Number: If the leaf was previously part of another fabric or misconfigured, it may need to be wiped and re-initialized.

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