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5.8(0.32.5) is an Affected Release
ACS version 5.8(0.32.5) is running on the SNS-3495-K9 appliance with the same symptoms from backup interface configuration. The affects of the configuration are immediate. Occasionally the ACS server properly sends ...
https://www.cisco.com/c/dam/en/us/td/docs/switches/datacenter/sw/design/vpc_design/vpc_best_practices_design_guide.pdf
Starting at page 81 are the Unsupported Layer3 Designs. The design you propose is Figure 60 (roughly).
Unfortunately it is not supported to run any dynamic routing protocol over vPC to the vPC switch. This is because of the conflict in Layer2 path selection by the port channel and Layer3 path selection by the routing protocol. Once a frame enters on o...
