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AS7726-32X - Troubleshoot for switch port link problems Follow

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ann302_chung 鍾雅安
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Purpose : 

This article describes how to check the hardware portion for troubleshooting switch ports cannot link up problems.

Model : 

AS7726-32X

Procedure : 

Step-1 Please make sure your network cable is good first

Step-2 Please power cycle the switch and boot into the ACCTON-DIAG for troubleshooting

Step-3 Enter the command to set port speed

Set the port speed to 100G on the uplink ports.

root@(none):/# swutil -C -r 100G
switch config mode: 100G

If you want to test with port speeds 40G, please execute the "swutil -C -r 40G".

Step-4 Setup the environment for specific ports

For example:

mceclip0.png

  • Use a pair of 100G transceivers to connect port1 and port2.
  • Use a pair of 10G transceivers to connect the last 10G ports.

Step-5 Enter the command to check port status

Basically, plugging those cables and transceivers does not require additional settings, the ports will link up directly if everything is properly.

The port mapping as below :

  • ce0~ce31 is physical port1~port32
  • xe0~xe1 is physical 10G
root@(none):/# swutil ps
ena/ speed/ link auto STP lrn inter max cut loop
port link Lns duplex scan neg? state pause discrd ops face frame thru? back
ce0( 1) up 4 100G FD SW No Forward TX RX None FA CAUI4 9412 No
ce1( 5) up 4 100G FD SW No Forward TX RX None FA CAUI4 9412 No
ce2( 9) down 4 100G FD SW No Forward TX RX None FA CAUI4 9412 No
ce3( 13) down 4 100G FD SW No Forward TX RX None FA CAUI4 9412 No
ce4( 17) down 4 100G FD SW No Forward TX RX None FA CAUI4 9412 No
ce5( 21) down 4 100G FD SW No Forward TX RX None FA CAUI4 9412 No
<omit>
ce30(123) down 4 100G FD SW No Forward TX RX None FA CAUI4 9412 No
ce31(127) down 4 100G FD SW No Forward TX RX None FA CAUI4 9412 No
xe0( 66) up 1 10G FD SW No Forward TX RX None FA XFI 9412 No
xe1(130) up 1 10G FD SW No Forward TX RX None FA XFI 9412 No

If the fiber ports CANNOT link up, please refer to step-6 for debugging.

Step-6 Check the fiber port

There are three items need to be checked here.

  • Dump the EEPROM of the transceiver
    Please use the command "trcv-dev [Port number] dump" to dump the EEPROM of the transceiver according to the port you used.
    *AS7726-32X has a total of 32 fiber ports, the [Port number] starts from 0 to 31.
    *The switch should be able to read EEPROM information properly.
    root@(none):/# trcv-dev 0 dump
    [QSFP1]:
    0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
    00: 11 07 02 f0 00 f0 00 00 00 22 22 55 55 00 00 00 ????.?...""UU...
    10: 00 00 00 00 00 00 10 45 00 00 82 0b 00 00 00 00 ......?E..??....
    20: 00 00 61 75 65 67 6a 23 6a ed 00 1e 00 00 00 00 ..auegj#j?.?....
    30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    60: 00 00 ff 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    80: 11 cc 23 80 00 00 00 00 00 00 00 05 ff 00 00 00 ??#?.......?....
    90: 00 00 32 00 53 4f 4e 59 20 20 20 20 20 20 20 20 ..2.SONY
    a0: 20 20 20 20 00 00 01 4a 43 58 4e 32 32 30 31 20 ..?JCXN2201
    b0: 20 20 20 20 20 20 20 20 45 53 00 00 00 00 46 76 ES....Fv
    c0: 01 07 ff 5e 32 30 31 37 33 31 30 30 39 4d 41 20 ??.^201731009MA
    d0: 20 20 20 20 31 37 30 37 33 31 39 39 00 10 68 77 17073199.?hw
    e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
  • Check the "pre-emphasis" and "link training"
    If you are using optical transceiver or AOC cable, then there is no additional settings are required here. By default, our DIAG already loaded the "pre-emphasis" accordingly.
    If you are using the DAC cable, please enable the "link training" function.
    The following command is used to enable the "link training" function:
    root@(none):/# swutil phy control ce LT=1
    Current PHY control settings of ce0 ->
    Preemphasis = 0x1a4a00
    DriverCurrent = 0xffffffff
    DFE ENable = True
    LP DFE ENable = True
    BR DFE ENable = False
    LinkTraining Enable = True
    Interface = 0x3e
    <omit>
  • Regarding the LP mode(Low Power mode) of the QSFP28 100G port, in the AS7726-32X design, the PIN of lp mode is always low, which remains high power.
    If the optical module still cannot be linked up, we suggest replacing the QSFP.
  • Regarding the last 10G port, our AS7726-32X is using Broadwell D-1518 CPU, so this unit doesn't support MAC to CPU but supports MAC to front ports.
    In our ACCTON-DIAG, no additional settings are required, it will be linked by default.

If the above items are checked, but the fiber port still cannot be linked up, please save all logs of the above test and submit the ticket to Edgecore Support.

 

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