FYI - After much testing, it appears this configuration is only for sending of traps. I've tried it every way, the HP does not answer to OID 1.3.6.1.2.1.138 (RFC 4444 isisMIB) after setting the context name.
The manual even states "After you enable SNMP notification sending for TRILL", I guess polling the mib is not available. Has anyone else run into this?
-Ryan