Symptom

The _show module_ command from a N9K-C9332 switch running the standalone NX-OS operating system (non-ACI) may indicate that the hardware has failed. switch# show module Mod Ports Module-Type Model Status --- ----- ------------------------------------------------ --------------------- -------- 1 34 32x100G QSFP28 + 2x10G SFP+ Ethernet Module N9K-C9332C ok 27 0 Virtual Supervisor Module N9K-C9332C active * Mod Sw Hw Slot --- ----------------------- ------ ---- 1 10.4(1) 2.0 NA 27 10.4(1) 2.0 VSUP Mod MAC-Address(es) Serial-Num --- -------------------------------------- ---------- 1 9c-54-16-62-68-06 to 9c-54-16-62-68-33 FLM12345678 27 9c-54-16-62-68-06 to 9c-54-16-62-68-33 FLM12345678 Mod Online Diag Status --- ------------------ 1 Fail 27 Pass * this terminal session The output of the _show diagnostic result module 1_ command will indicate the BootupPortLoopback diagnostic test failed on interface Ethernet1/1 only. switch# show diagnostic result module 1 Current bootup diagnostic level: complete Module 1: 32x100G QSFP28 + 2x10G SFP+ Ethernet Module 6) BootupPortLoopback: F Port 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 ----------------------------------------------------- F U U U . U U U . U U U . U U U Port 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 ----------------------------------------------------- . U U U . U U U . U U U . U U U Port 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 ----------------------------------------------------- . U U U . U U U . U U U . U U U Port 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 ----------------------------------------------------- . U U U . U U U . U U U . U U U Port 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 ----------------------------------------------------- . U U U . U U U . U U U . U U U Port 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 ----------------------------------------------------- . U U U . U U U . U U U . U U U Port 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 ------------------------------------------------------------------ . U U U . U U U . U U U . U U U Port 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 --------------------------------------------------------------------- . U U U . U U U . U U U . U U U Port 129 130 131 132 133 134 135 136 ------------------------------------- . U U U . U U U A failure reason of "Loopback test failed. Packets lost on the SUP in the receive direction" may also be seen in the output of the _show diagnostic result module 1 test 6 detail_ command. switch# show diagnostic result module 1 test 6 detail Current bootup diagnostic level: complete Module 1: 32x100G QSFP28 + 2x10G SFP+ Ethernet Module Diagnostic level at card bootup: complete Test results: (. = Pass, F = Fail, I = Incomplete, U = Untested, A = Abort, E = Error disabled) ______________________________________________________________________ 6) BootupPortLoopback: F Port 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 ----------------------------------------------------- F U U U . U U U . U U U . U U U Port 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 ----------------------------------------------------- . U U U . U U U . U U U . U U U Port 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 ----------------------------------------------------- . U U U . U U U . U U U . U U U Port 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 ----------------------------------------------------- . U U U . U U U . U U U . U U U Port 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 ----------------------------------------------------- . U U U . U U U . U U U . U U U Port 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 ----------------------------------------------------- . U U U . U U U . U U U . U U U Port 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 ------------------------------------------------------------------ . U U U . U U U . U U U . U U U Port 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 --------------------------------------------------------------------- . U U U . U U U . U U U . U U U Port 129 130 131 132 133 134 135 136 ------------------------------------- . U U U . U U U Error code ------------------> DIAG TEST FAIL(Loopback test ) Total run count -------------> 1 Last test execution time ----> Sat Nov 25 16:11:58 2023 First test failure time -----> Sat Nov 25 16:12:42 2023 Last test failure time ------> Sat Nov 25 16:12:42 2023 Last test pass time ---------> n/a Total failure count ---------> 1 Consecutive failure count ---> 1 Last failure reason ---------> Loopback test failed. Packets lost on the SUP in the receive direction Next Execution time ---------> n/a ______________________________________________________________________

Conditions

This issue has been observed on the N9K-C9332C model of Nexus data center switch only. This issue has not been observed on any other model of switch at this time.

Workaround

There is no known workaround to this issue at this time. This issue is not indicative of a hardware failure and is benign in nature.

Further Problem Description