[Nebula 20.00] Port Advisor Alerts

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  • Zyxel_Tina
    Zyxel_Tina Posts: 933 image  Zyxel Employee
    Zyxel Certified Network Administrator - Security Zyxel Certified Network Administrator - Switch 100 Answers 500 Comments
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    Hi @GiuseppeR,

    The hotfix has already been released and applied.

    This issue was mainly related to changes in behavior/mechanism after the recent Nebula update, and the fix was implemented on the NCC side.

    Could you please help confirm whether you are still experiencing these alerts?

    If the issue persists or if you encounter any further concerns, kindly provide us with the organization/site name of the affected sites so we can assist with further investigation. Thank you.

    Zyxel Tina

  • Dylan96
    Dylan96 Posts: 46 image  Freshman Member
    Zyxel Certified Network Administrator - Nebula Zyxel Certified Network Administrator - Security First Comment Friend Collector
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    https://community.zyxel.com/en/discussion/comment/84677#Comment_84677

    Hi, @Zyxel_Tina

    After a thorough investigation, it appears that this “flapping” is very often caused by power‑saving features of the device connected to the port.

    In fact, in several cases, simply disabling Ethernet power saving on a PC or the standby mode on a printer was enough to prevent these alerts from being generated.

    This represents an issue because it is not related to any physical problem with the connection.

    The detection mechanism for this alert should therefore be reviewed; otherwise, it's useless.

  • Mk88_it
    Mk88_it Posts: 83 image  Ally Member
    First Comment Friend Collector Fourth Anniversary
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    I can confirm what @Dylan96 wrote. It seems that almost 90% cases of these alerts are generated by devices going in power saving mode. Could you improve the detection method for Cable health
    → Poor cable quality ?

  • GiuseppeR
    GiuseppeR Posts: 760 image  Guru Member
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Engineer Level 1 - Nebula 5 Answers First Comment
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    Hello everyone, recently I saw a drop in email notifications. So very good.

    Anyway it seems to me that the power saving feature could trigger that alert, honestly I’m still looking to understand this better to collect a proof of that.

  • Zyxel_Tina
    Zyxel_Tina Posts: 933 image  Zyxel Employee
    Zyxel Certified Network Administrator - Security Zyxel Certified Network Administrator - Switch 100 Answers 500 Comments
    edited May 8
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    Hi @Dylan96,

    Sorry for the late reply. Regarding your concern about the cable health detection mechanism, we are still discussing and clarifying the details. Could you please enable Zyxel Support Access again?

    Once we have further information after the investigation, we will get back to you with an update. We appreciate your patience and understanding!

    Zyxel Tina

  • Dylan96
    Dylan96 Posts: 46 image  Freshman Member
    Zyxel Certified Network Administrator - Nebula Zyxel Certified Network Administrator - Security First Comment Friend Collector
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    @Zyxel_Tina zyxel support enabled

  • Zyxel_Tina
    Zyxel_Tina Posts: 933 image  Zyxel Employee
    Zyxel Certified Network Administrator - Security Zyxel Certified Network Administrator - Switch 100 Answers 500 Comments
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    Hi @Dylan96,

    Thank you. We will inform you of any updates as soon as we have them.

    We appreciate your cooperation and patience.

    Zyxel Tina

  • Zyxel_Tina
    Zyxel_Tina Posts: 933 image  Zyxel Employee
    Zyxel Certified Network Administrator - Security Zyxel Certified Network Administrator - Switch 100 Answers 500 Comments
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    Hi @Dylan96,

    Thank you for your patience!

    We'd like to clarify clearer of how the Port Advisor alert mechanism works: an alert is triggered when a port experiences 5 link up/down cycles within a 1-minute window — where one cycle counts as one link-up event followed by one link-down event. This means the port must undergo at least 10 link state changes within that timeframe.

    This feature is specifically designed to detect abnormal connection instability, such as poor cable quality, loose connections, or a faulty port.

    Regarding the power-saving behavior mentioned earlier — while we understand the concern, typical device power-saving modes would generally be unlikely to produce 5 full up/down cycles within a single minute. In addition, we attempted to reproduce the issue in our lab using a laptop, but were only able to observe 2 link up/down cycles, which is below the alert threshold.

    However, we recognize that different device types may behave differently, which is why your environment is valuable for further investigation.

    As we are currently seeing hits/alerts triggered from multiple ports at your site, it would be helpful if you could share what client devices are connected under switch SW_L11, along with their models. This will give us a clearer picture of the situation and help us explore whether there are ways to further improve the detection mechanism.

    Zyxel Tina

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