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Cisco Bug: CSCvs22023 - Always Prefer IP FabricLooseNode Over MAC FabricLooseNode

Last Modified

Jan 13, 2020

Products (1)

  • Cisco Application Policy Infrastructure Controller (APIC)

Known Affected Releases

4.2(2g)

Description (partial)

Symptom:
This can cause a complete outage to vmm integrated EPs if pre-provision is not in place. If the host discovery is not successful, policy will not be dynamically pushed to the leaf switches as VMs are attached.

Conditions:
You will see the following faults on the APIC: "Operational issues detected on LooseNode: xx:xx:xx:xx:xx:xx, error: [LooseNode with hosts attached is disconnected from Network. This typically indicates that the ports connecting to Leaf Node(s) are either down or not connected.]" If you check the uplink information in vCenter you will see both a  MAC management address and IP management address reported via LLDP. Due to this, the APIC will install a fabricLooseNode object for both an IP and MAC entry and the hvsAdj object(s) will only show the ESXI hosts sitting behind the MAC fabricLooseNode because it seems that the MAC info is reported last.
 
moquery -c fabricLooseNode | egrep dn <--- checks fabricLooseNode objects
moquery -c hvsAdj <--- checks adjacency info which is reported from VC
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