We have recently deployed a few Nexus 5596s running NX-OS 5.1(3)N1(1a). We have been using a UnDP poller OLD-CISCO-SYS-MIB:whyReload OID 1.3.6.1.4.1.9.2.1.2 which works for all Cisco devices except ASAs. This no longer works for the Nexus OS. UnDP returns 'OID not supported'. Does anyone know if this is a bug, Cisco moved this object or it is no longer supported in the NX-OS?