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    • xgs1250-12 switches, failed auto negotiation on port 9 - 11

    Posts: 3
    First Comment
    in Switch
    Hi there,

    if I connect a xgs1250-12 to a router with 100M connectivity to port 9, 10 or 11,
    auto negotiation fails and no connection will be established. 
    If I set one of these ports on the switch to 100M manually, all works fine.

    Is this a firmware bug? 

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    All Replies

    • Posts: 3,004  Zyxel Employee
      Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate
      Hi @zyxtax,

      Welcome to the Zyxel community!
      This is more likely due to the cable quality, have you tried to connect a new cable to fix it?

      In addition, could you share which model your router is and what firmware version your XGS1250-12 is?

      Zyxel Melen


    • Posts: 3
      First Comment
      Hi,

      the installed firmware is V1.00(ABWE.1)C0.
      I just saw, that there is a       V1.00(ABWE.2)C0 available.
      Though the release notes does not mention any auto-negotiation issues, I will give it a try.
    • Posts: 3
      First Comment
      No, unfortunately this did not fixed it.
    • Posts: 3,004  Zyxel Employee
      Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate
      Hi @zyxtax,

      Could you change the cable or connect XGS1250 port 9-11 to other devices to check whether it can link up?
      This issue is more likely a layer 1 issue, so it would be easier to clarify the issue by doing some cross-tests.
      Zyxel Melen


    • Posts: 3,004  Zyxel Employee
      Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate
      Hi @zyxtax,

      In addition, you also can connect a loop on ports 9, 10, and 11 to check if the switch can link up or not.
      If it cannot link up in auto-negotiation, it might hardware issue. Please follow this link to submit RMA request 
      Zyxel Melen


    • Posts: 1
      First Comment
      Hi
      I've got the very same issue. For a given cable the link up in auto-negotiation works fine for chosen ports 1-8 and 12 (loop detection works), but it doesn't for ports 9-11.
      I tried to start a RMA but this doesn't work, I am always reconnected to "myZyxel", where I do not find any option to start an RMA.
    • Posts: 3,004  Zyxel Employee
      Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate
      Hi @0115599,


      Welcome to the Zyxel community!
      Please reference this link to submit RMA request.
      Zyxel Melen


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