APIC: APIC doesn’t find the Leaf Switches

There can be a nasty little problem (you might want to call it bug) that prevents the APIC from discovering the connected Nexus Leaf Switches.

The reason behind it is that after an CIMC Update and/or wipe of the CIMC it can happen that LLDP is enabled on the VIC Card. The problem here is that if it is enabled on the VIC, the LLDP messages get intercepted by the Firmware on the VIC and never reach the APIC Software. So the APIC can’t discover the Leaf’s.

Here’s how to verify this:

No LLDP Neighbors seen from the Leafs:


Log on via ssh to the CIMC:

Afterwards you power cycle the Server.

Verification that LLDP is no disabled on the VIC:



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2 Thoughts to “APIC: APIC doesn’t find the Leaf Switches”

  1. Jakub Horbacewicz

    Also, a useful command on the APIC in regards to troubleshooting LLDP/discovery issue is: acidiag run lldptool [in/out] eth2-[1/2]

    1. Thx for the Info Jakub!

      The command is really usefull! I’ll add it to the post!

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