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Cisco Bug: CSCut22611 - 3850 - 1 GiG 1000BaseLX negotiates to "HALF DUPLEX" after reload

Last Modified

Feb 12, 2018

Products (1)

  • Cisco Catalyst 3850 Series Switches

Known Affected Releases


Description (partial)

1 Gig port (1000BaseLX) sometime starts operating at HALF DUPLEX mode after a reload.

Shut/no shut or plugging/unplugging the SFP does not fix the issue. Only way to fix it, is remove the SFP, hardcode the duplex to full and insert SFP back.

WS-C3850-24U running 3.3.5
Both ports need to be connected to C3850-NM-4-1G. 
GBIC used- GLC-LH-SMD for 1000BaseLX
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