(don't know if it is also valid for the modular ios though)
what i did is the following: i renamed one of the two images to another name, then followed the ISSU upgrade procedure.
Of course, it worked flawlessly. (you can't have much incompatibility between two same versions...differentiating only by name...doh).
If you have a NDA with Cisco, you could ask for an engineering version to test with, however, make sure it is the same packaging level (ie. ip base,ip services). i had to cancel because it was a different version.
Cisco has just released the SXI1 release. Now we can finally test ISSU upgrade functionality (i just did it: from SXI -> SXI1 and it worked perfectly: no downtime longer than 500 ms at reboot points). no session loss througout upgrade process.
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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