Comware

 View Only
last person joined: yesterday 

Back to discussions
Expand all | Collapse all

No "stable" link between Aruba 2920 (J9728A) and 2930M (JL322A) Using 7m DAC-cable (J9285D)

This thread has been viewed 6 times

  • 1.  No "stable" link between Aruba 2920 (J9728A) and 2930M (JL322A) Using 7m DAC-cable (J9285D)

    Posted Feb 13, 2024 11:02 AM

    Hi there,

    I thought I'd chosen a simple solution by using a DAC-cable as an uplink between 2 switches.

    Have I overlooked something?  Please advise.

    Regards, Simon

    Switch 1: 2920-48G (J9728A) + 2-port 10-GbE SFP+ (J9731A)
    Switch 2: 2930M-48G-PoE+ (JL322A) + 4p 10GbE SFP+ Module (JL083A)
    Cable : J9285D

    Both switches report "Excessive link state transitions":

    I 01/01/90 00:22:46 00077 ports: ST1-CMDR: port 1/A1 is now off-line
    I 01/01/90 00:22:46 00076 ports: ST1-CMDR: port 1/A1 is now on-line
    I 01/01/90 00:22:45 00077 ports: ST1-CMDR: port 1/A1 is now off-line
    I 01/01/90 00:22:44 00076 ports: ST1-CMDR: port 1/A1 is now on-line
    I 01/01/90 00:22:41 00077 ports: ST1-CMDR: port 1/A1 is now off-line
    W 01/01/90 00:22:41 02672 FFI: ST1-CMDR: port 1/A1-Excessive link state transitions

    Tranceiver details:

    # sh interfaces transceiver 1/A1 detail
     
    Transceiver in 1/A1
       Interface Index    : 49
       Type               : SFP+SR
       Model              : J9150A
       Connector Type     : LC
       Wavelength         : 850nm
       Transfer Distance  : 300m (50um), 300m (62.5um), 300m (50um OM3),
       Diagnostic Support : DOM
       Serial Number      : AD2206180092
     
     Status
       Temperature : 24.421C
       Voltage     : 3.2560V
       Tx Bias     : 0.658mA
       Tx Power    : 6.5524mW, 8.164dBm
       Rx Power    : 0.0001mW, -39.999dBm
     
      Recent Alarms :
     
           Temp high alarm
           Vcc low alarm
           Tx bias low alarm
           Tx power high alarm
           Tx power low alarm
           Rx power low alarm
           Temp high warning
           Vcc low warning
           Tx bias low warning
           Tx power high warning
           Tx power low warning
           Rx power low warning
     
      Recent Errors :
     
           Rx loss of signal
           Tx fault



  • 2.  RE: No "stable" link between Aruba 2920 (J9728A) and 2930M (JL322A) Using 7m DAC-cable (J9285D)

    Posted Feb 14, 2024 04:57 AM

    Hi Simon,

    i think there have gone several things sideways.

    1. You attached the Transceiver-Output of an SFP+ 10G SR (fiber) Transceiver, but you were talking about a 7m DAC+ Cable
    2. The D-Revision of that DAC+ Cable is only supported on the 2930m-Switch. The 2920 has only the B-Revision  J9185B) listed as supported.
      Here maybe the allow-unsupported-transceivers may help.
    3. As i always had Problems with DAC+ Cables between different Stacks & HW-Revisions i always opt for a truly interchangeable Signaling aka. Fiber-Optics.
      At least here is a Standard that gets respected by most of the vendors.

    I'd change to a SFP+ ShortRange Setup.

    On both Switches you can use fully supported D-Revision Transceivers (J9150D) when having the latest firmware on the 2920.
    The 2930m also allowes the use of th (J9150C with DOM).

    You should also look into spanning-tree (matching and working), maybe activated UDLD?, Smart-Links active?, Loop-Protection with auto-reenable?...

    Best of Luck to you

    Franz



    ------------------------------
    prefers to not experiment with live customer equipment...
    ------------------------------

    Original Message


  • 3.  RE: No "stable" link between Aruba 2920 (J9728A) and 2930M (JL322A) Using 7m DAC-cable (J9285D)

    Posted Feb 14, 2024 05:21 AM

    Hi Franz,

    Thanks for the, much appreciated, suggestions. 

    I'm well aware of the alternative fiber option, but in this case I needed an option that could withstand a bit more abuse.

    It's just that this setup checked all the boxes according to the latest "Transceiver Guide".

    So I might have overlooked something.

    Regards, Simon


    Original Message