Depending upon which Nexus platform and which NX-OS version you're running, it's quite possibly the Control Plane Policing (CoPP) feature, introduced in NX-OS 5.1(3)N1(1), that's causing the drops.
You can see if that's the case using the show policy-map interface control-plane and look for incrementing violations in the class that matches ICMP. There's a fair amount of information in the output so I find the quickest way to spot this is using the show policy-map interface control-plane | in "class|violate" command and look for a non zero value. Assuming the default configuration, on the Nexus 5000 this will be the copp-system-class-icmp-echo
VMware Trunk Port Group is supported from ACI version 2.1
VMM integration must be configured properly
ASA device package must be uploaded to APIC
ASAv version must be compatible with ACI and device package version
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