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  1. #1
    Junior Member
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    Mar 2017
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    Angry TL-SG105E and TL-SG108E lose VLAN/IP configuration randomly

    Model :

    Hardware Version :

    Firmware Version :

    ISP : [/COLOR]

    I'm using two TL-SG105E 2.0 switches and one TL-SG108E 2.0 switch.


    They're all running 20160526 Rel.34615.


    Periodically, two of these switches have reset themselves, losing their VLAN configuration and their own IPs. In one case the switch retained its user/pass, I don't remember the other case.


    In the first case, the switch reset itself after I powered it off and on again. In the second case, it just randomly did this late at night while I was using it.


    Either way, I was forced to hunt around subnets/vlans looking for the switch, until I found it squatting on IP 192.168.0.1.


    Before you ask, I hit the "Save Config" button several times, and even rebooted these switches with the "Save Config" option checked in the past.

  2. #2
    I just lost configuration data just like the poster above.

    I have both TL-SG105E and TL-SG108E in my network. Both have 802.1Q VLAN configurations. After a sudden power loss (from a lightning storm), the switches powered back up without the 802.1Q VLAN configuration. Both switches did retain some configuration: login/password, and static IP address so there is some kind of persistent storage on the switches.

    I was able to recover with backup configs but loss of configuration from a power cycle event is not acceptable. Is this a known issue? Is there a fix? Without a fix, these products might as well be just a dumb switch and cannot be used for anything that utilizes the 802.1Q VLAN features.

    TL-SG105E: 1.0.2 Build 20160526 Rel.34540
    TL-SG108E: 1.0.2 Build 20160526 Rel.34615

  3. #3
    I bought the same "smart" switch (TL-SG105E) some days ago, and I have the same issue.

    After the power lose the switch don't remember password.
    Sometimes even don't remember configurations and VLANs.

    Is this a dumb switch or what ???

    Tnx in advance for answer !

  4. #4
    On a hunch, I wanted to see if saving the switch configuration using the Easy Smart Configuration utility instead of the web GUI made any difference with VLAN config. loss issue. Surprisingly, it worked.

    I installed the utility; pressed the save button; then pulled power from the switch. I left the power off for ~2 min. then restored power. This time, the switch powered back up with the VLAN configs intact. I repeated the power cycle test and the VLAN configs are still there.

    Others having the same config loss problem, please give this a try and report back.

    I am waiting for the next real power failure to see if this workaround truly works.

  5. #5
    Quote Originally Posted by absentrecall View Post
    Others having the same config loss problem, please give this a try and report back.
    Yes, it's a bug in the firmware. The function "Save Config" works just one time after a reboot/power-cycle.

    You can see this when clicking "Save Config": a message "Saving Configuration to FLASH" appears for a very short moment followed by "Save the configuration successfully".

    Next time you click on "Save Config" only the latter message appears, but nothing is saved into flash memory. So, after a power failure all changes are lost even if you saved them.

    Work-around until fixed: Do a prophylactic reboot or power-cycle before (or after) changing/saving settings and save the config only once after all settings you want to change have been changed.

    This bug also appears in version 3 firmware, which is just a visual identity update (new TP-Link logo and design) and as such installs even on V2 hardware. Tested on a TL-SG108E V2. A very cheap way to make your switch a V3 switch:

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    Last edited by R1D2; 04-05-2017 at 01:14.

  6. #6
    @R1D2, thanks for the clear explanation of the bug and workaround.

    I have not not rebooted since my last power cycle test and I don't remember if I had saved config more than one time since the last reboot. At least now, I can follow your workaround and (fingers crossed), know that I won't lose my config after the next power outage. If I had not seen this workaround, I would have returned these switches for refunds.

    Does TP-Link tech support know about this issue? It seems like this issue will affect just about every switch owner at some point in time so it needs a proper firmware fix. Does TP-Link tech support monitor these forums? If so, is there a firmware update on the way with a proper fix?

  7. #7
    Quote Originally Posted by absentrecall View Post
    Does TP-Link tech support know about this issue? It seems like this issue will affect just about every switch owner at some point in time so it needs a proper firmware fix. Does TP-Link tech support monitor these forums? If so, is there a firmware update on the way with a proper fix?
    Q1 re bug report: yes, I have informed TP-Link support and also sent a link to this thread.

    Q2 re monitoring: can't definitely answer which groups are monitored by TP-Link tech support, but I think they will look at this specific thread.

    Q3 re bug fix: I hope so!


 

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