4100h 13m 27.112s(6349823ms): *Jan 21 00:06:59.757: %VXE_VNIC_IF-3-MSGINITERROR: VXE vNIC interface command: link_status failed: -2 for GigabitEthernet1 4100h 13m 35.370s(8258ms): Exception to IOS Thread: 4100h 13m 35.421s( 51ms): Frame pointer 0x7F2E0DE09868, PC = 0x7F2E49DA21F7 4100h 13m 35.421s( 0ms): UNIX-EXT-SIGNAL: Aborted(6), Process = Net Background 4100h 13m 35.421s( 0ms): -Traceback= 1#d978369ba3324fc42d47ed4f1a2cc7d8 c:7F2E49D6D000+351F7 4100h 13m 35.421s( 0ms): Fastpath Thread backtrace: 4100h 13m 35.421s( 0ms): -Traceback= 1#d978369ba3324fc42d47ed4f1a2cc7d8 c:7F2E49D6D000+E0AF3 prelib:7F2E9557C000+2CBB 4100h 13m 35.421s( 0ms): Auxiliary Thread backtrace: 4100h 13m 35.421s( 0ms): -Traceback= 1#d978369ba3324fc42d47ed4f1a2cc7d8 pthread:7F2E4994C000+BB45 prelib:7F2E9557C000+2CBB 4100h 13m 35.421s( 0ms): RAX = 0000000000000000 RBX = 00007F2E10882CD0 4100h 13m 35.421s( 0ms): RCX = FFFFFFFFFFFFFFFF RDX = 0000000000000006 4100h 13m 35.421s( 0ms): RSP = 00007F2E0DE09868 RBP = 00007F2E0DE09A20 4100h 13m 35.421s( 0ms): RSI = 0000000000007071 RDI = 0000000000007071 4100h 13m 35.421s( 0ms): R8 = 00007F2E95878A40 R9 = 6F206E7572726576 4100h 13m 35.421s( 0ms): R10 = 0000000000000008 R11 = 0000000000000206 4100h 13m 35.424s( 3ms): R12 = 0000000000000003 R13 = 00007F2DB52780D0 4100h 13m 35.427s( 3ms): R14 = D08027B52D7F0000 R15 = 00007F2E0BC72DC0 4100h 13m 35.431s( 4ms): RFL = 0000000000000206 RIP = 00007F2E49DA21F7 4100h 13m 35.434s( 3ms): CS = 0033 FS = 0000 GS = 0000 4100h 13m 35.437s( 3ms): ST0 = 0000 0000000000000000 ST1 = 0000 0000000000000000 4100h 13m 35.441s( 4ms): ST2 = 0000 0000000000000000 ST3 = 0000 0000000000000000 4100h 13m 35.470s( 29ms): ST4 = 0000 0000000000000000 ST5 = 0000 0000000000000000 4100h 13m 35.470s( 0ms): ST6 = 0000 0000000000000000 ST7 = 0000 0000000000000000 4100h 13m 35.470s( 0ms): X87CW = 037F X87SW = 0000 X87TG = 0000 X87OP = 0000 4100h 13m 35.470s( 0ms): X87IP = 0000000000000000 X87DP = 0000000000000000 4100h 13m 35.470s( 0ms): XMM0 = 00000000000000000000000000000000 4100h 13m 35.470s( 0ms): XMM1 = 25252525252525252525252525252525 4100h 13m 35.470s( 0ms): XMM2 = 00000000000000000000000000000000 4100h 13m 35.470s( 0ms): XMM3 = FFFF000000000000FFFFFF00FFFFFFFF 4100h 13m 35.472s( 2ms): XMM4 = 00000000000000000000000000000000 4100h 13m 35.475s( 3ms): XMM5 = 00000000000000000000000000000000 4100h 13m 35.478s( 3ms): XMM6 = 00000000000000000000000000000000 4100h 13m 35.481s( 3ms): XMM7 = 5C5C5C5C5C5C5C5C5C5C5C5C5C5C5C5C 4100h 13m 35.484s( 3ms): XMM8 = 36363636363636363636363636363636 4100h 13m 35.487s( 3ms): XMM9 = 36363636363636363636363636363636 4100h 13m 35.490s( 3ms): XMM10 = 5C5C5C5C5C5C5C5C5C5C5C5C5C5C5C5C 4100h 13m 35.502s( 12ms): XMM11 = 5C5C5C5C5C5C5C5C5C5C5C5C5C5C5C5C 4100h 13m 35.502s( 0ms): XMM12 = 00000000000000000000000000000000 4100h 13m 35.502s( 0ms): XMM13 = 00000000000000000000000000000000 4100h 13m 35.502s( 0ms): XMM14 = 00000000000000000000000095920000 4100h 13m 35.506s( 4ms): XMM15 = 00000000000000000000000095920000 4100h 13m 35.509s( 3ms): MXCSR = 00001F80 4100h 13m 35.512s( 3ms): Writing crashinfo to bootflash:crashinfo_RP_00_00_20180121-000709-UTC The log is mentioning "VXE vNIC interface command: link_status failed: -2 for GigabitEthernet1" I wasn't able to find an event related to your ENI that could have cause such an error. Apparently, it leads your instance to a system crash. Hence, I confirm this reboot has not been initiated by an AWS mechanism but by the Operating System itself.