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The GNSS chassis LED of Nexus 93180YC-FX3 switches running any of the NX-OS software releases listed below may be either lit red, or rapidly oscillating between green and red even though GPS/GNSS is not connected to the switch and the SyncE feature is not configured on the switch. * * 10.2(3) * * 10.2(4) * * 10.2(5) * * 10.2(6) * * 10.2(7) * * 10.3(1) * * 10.3(2) * * 10.3(3) * * 10.3(4a) * * 10.4(1) * * 10.4(2) * Note that even though the "Known Fixed Releases" field of this bug indicates that NX-OS 10.2(6) and later contain the fix for this issue, this issue is not fixed in NX-OS 10.2(6) and later. The fix implemented through this bug was a partial fix to the issue, but the issue is not fully resolved. The complete fix is tracked through Cisco bug ID CSCwi92703. This issue is cosmetic in nature - only the status of the LED is affected by this issue.
This issue is only observed on Nexus 93180YC-FX3 switches running any of the NX-OS software releases listed below. This behavior was not observed on earlier NX-OS software releases - in earlier NX-OS software releases, the GNSS chassis LED was not lit at all under these conditions. * * 10.2(3) * * 10.2(4) * * 10.2(5) * * 10.2(6) * * 10.2(7) * * 10.3(1) * * 10.3(2) * * 10.3(3) * * 10.3(4a) * * 10.4(1) * * 10.4(2) * Note that even though the "Known Fixed Releases" field of this bug indicates that NX-OS 10.2(6) and later contain the fix for this issue, this issue is not fixed in NX-OS 10.2(6) and later. The fix implemented through this bug was a partial fix to the issue, but the issue is not fully resolved. The complete fix is tracked through Cisco bug ID CSCwi92703.
There is no known workaround for this issue. As this issue is cosmetic in nature, the color of the GNSS LED can be safely ignored if the SyncE feature is not configured and no GPS/GNSS is connected to the switch.
Note that even though the "Known Fixed Releases" field of this bug indicates that NX-OS 10.2(6) and later contain the fix for this issue, this issue is not fixed in NX-OS 10.2(6) and later. The fix implemented through this bug was a partial fix to the issue, but the issue is not fully resolved. The complete fix is tracked through Cisco bug ID CSCwi92703. If you perform an In-Service Software Upgrade (ISSU) to a fixed NX-OS software release through the _non-disruptive_ keyword to the _install all nxos_ command, the GNSS chassis LED will remain in a consistently-red or rapidly oscillating status after the upgrade until the _frequency-synchronization_ feature is toggled on and off as shown below. switch# *configure terminal* switch(config)# *feature frequency-synchronization* switch(config)# *no feature frequency-synchronization* switch(config)# *end* switch# Toggling the _frequency-synchronization_ feature is non-disruptive in nature and is highly unlikely to cause any production impact to the switch. However, as always, Cisco recommends performing configuration changes like this one during a maintenance window. Again, this configuration change is only necessary if the switch is upgraded to a fixed NX-OS software release through an ISSU upgrade. An example of an ISSU upgrade to NX-OS 10.2(6) (one of the fixed releases for this defect) is shown below. switch# *install all nxos bootflash:nxos64-cs.10.2.6.M.bin non-interruptive* These configuration changes are not necessary if the switch is upgraded to a fixed NX-OS software release through a disruptive (non-ISSU) upgrade through the normal _install all nxos_ command. An example of a disruptive (non-ISSU) upgrade to NX-OS 10.2(6) (one of the fixed releases for this defect) is shown below. switch# *install all nxos bootflash:nxos64-cs.10.2.6.M.bin*
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