VPC between 5510/5520 and 55xx is not supported whereas VPC between other 55xx models are supported.
In other words 5510/5520 cannot be peer with any Nexus 5k series. Both have below different ASICs and have different CFS messages which are not compatible.
5010/5020 – gatos asic
5548/5596 – carmel asic
In other words 5510/5520 cannot be peer with any Nexus 5k series. Both have below different ASICs and have different CFS messages which are not compatible.
5010/5020 – gatos asic
5548/5596 – carmel asic