Hi Suprit, A false endpoint (EP) entry on the leaf switch, which has persisted even after the endpoint has moved to another switch is generally regarded as a stale endpoint entry. This can occur due to a lot of conditions a few can be noted as below ...

Thats great!, yes it needs community strings in global scope. You also have APIC as SNMP aggregator feature if you want to tryout - https://www.cisco.com/c/en/us/td/docs/dcn/aci/apic/5x/basic-configuration/cisco-apic-basic-configuration-guide-51x/m_m...

Hello, Please share the output of "show snmp summary" and check if the snmp process is running on the leaf with an OID. Some troubleshooting steps are documented here - https://community.cisco.com/t5/data-center-and-cloud-knowledge-base/technote-snmp...