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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