Answering my own question for reference of anyone else who might need to know.
It *is* possible, but you only get an active/active LACP connection to an EX series switch running in a virtual chassis configuration.
Juniper's implementation of MC-LAG on non-EX devices only supports active/standby mode - one port of the VPC on the Nexus pair will go immediately into hot-standby mode and stay that way.
You have to fiddle with the LACP priorities to get any form of failover working - otherwiswe, the only way I could find to get the second leg of the LACP to go active was to shut down the primary on the Nexus, then shut down and no shut the port on the second Nexus.
Introduction This article will help you understand the steps on how to
download the UCS licenses from the Cisco Systems website and then
installing it on the UCS. The redacted (blue lines) just covers up
certain numbers for privacy please do not take them...
Introduction This article will help you understand and educate the
customer on how to clear their "expired licenses"
(license-graceperiod-expired) from their UCS-M. If a customer just
purchased a license and needs a step by step guide on how to download
Introduction Prepositioning is a powerful tools on the WAAS platform but
it is not always easy to figure out why your jobs are failing when
trying to retrieve the files.Here is a method that should help you to
figure out the reason why they are not succes...