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

zyxtax · December 2022

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?

Zyxel_Melen · December 2022

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?

zyxtax · December 2022

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.

zyxtax · December 2022

No, unfortunately this did not fixed it.

Zyxel_Melen · December 2022

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 · December 2022

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

0115599 · February 2023

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.

Zyxel_Melen · February 2023

Hi @0115599,

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

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

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