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Cisco Bug: CSCvs39382 - Link on Cisco Nexus 3100 device fails after inserting a CVR-QSFP-SFP10G (QSA) with GLC-LH-SMD

Last Modified

Sep 30, 2020

Products (59)

  • Cisco Nexus 3000 Series Switches
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 92348GC-X Switch
  • Cisco Nexus 3548 Switch
  • Cisco Nexus 3548-X Switch
  • Cisco Nexus 3636C-R Switch
  • Cisco Nexus 92160YC-X Switch
  • Cisco Nexus 9396PX Switch
  • Cisco Nexus 31108TC-V Switch
  • Cisco Nexus 3132Q-V Switch
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Known Affected Releases

7.0(3)I7(7) 9.2(4) 9.3(2)

Description (partial)

When a GLC-LH-SMD 1G SFP transceiver inside a CVR-QSFP-SFP10G (QSA) QSFP+ transceiver is inserted in a 40G QSFP+ interface of a Nexus 3100 device, the link may not reliably come up/up as expected when the GLC-LH-SMD transceiver is removed, then re-inserted inside the CVR-QSFP-SFP10G.

Furthermore, DOM information for the GLC-LH-SMD may not appear as expected. Specifically, the transceiver's "Current" reading may show as 0.00mA, the "Tx Power" reading may shows as N/A, and the transceiver's type may show as "Unknown Type-(unknown)".

N3K# show interface Ethernet1/51/1 transceiver details 
    transceiver is present
    type is Unknown Type-(unknown)    <<<
    name is CISCO
    part number is SFCT-5716PZ
    revision is 001
    serial number is XXX
    nominal bitrate is 1300 MBit/sec
    Link length supported for 9/125um fiber is 10 km
    cisco id is 3
    cisco extended id number is 4
    cisco part number is 10-2625-01
    cisco product id is GLC-LH-SMD
    cisco vendor id is V01

           SFP Detail Diagnostics Information (internal calibration)
                Current              Alarms                  Warnings
                Measurement     High        Low         High          Low
  Temperature   35.76 C        90.00 C    -10.00 C     85.00 C       -5.00 C
  Voltage        3.34 V         3.63 V      2.97 V      3.47 V        3.14 V
  Current        0.00 mA  --   65.09 mA     2.40 mA    61.00 mA       3.00 mA     <<<
  Tx Power          N/A         0.00 dBm  -13.01 dBm   -3.00 dBm     -9.50 dBm    <<<
  Rx Power      -5.71 dBm       0.00 dBm  -23.01 dBm   -3.00 dBm    -19.20 dBm
  Transmit Fault Count = 0
  Note: ++  high-alarm; +  high-warning; --  low-alarm; -  low-warning

1. Nexus 3100 device connected to a link.
2. Nexus 3100 has a GLC-LH-SMD 1G SFP transceiver inside of a CVR-QSFP-SFP10G (QSA) QSFP+ transceiver inserted in a 40G QSFP+ interface.
3. During the switch's uptime, the GLC-LH-SMD was removed, then re-inserted inside the CVR-QSFP-SFP10G.
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