NeophyteNeophyteResolution reached: finally walked away in frustration from attempting to use SNMPV3 and Juniper EX Virtual Chassis.
After extensive work with Juniper support, I discovered that even Advanced JTAC does not know how to make this work. While it is possible that LM SNMP operation might contribute to an interoperability issue, I am not interested in a line-by-line validation of adherence to RFCs. Regardless, I have serious doubts about Juniper's ability to preserve SNMPV3 communication across Virtual-Chassis Routing Engine mastership changes.
SNMPV3 works very well with stand-alone devices...but I do not recommend it for use in Virtual Chassis.
