[Nebula 20.00] Port Advisor Alerts

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Dylan96
Dylan96 Posts: 44 image  Freshman Member
Zyxel Certified Network Administrator - Nebula Zyxel Certified Network Administrator - Security First Comment Friend Collector
in Nebula

After the latest Nebula update, we started receiving a large number of Port Advisor alerts especially poor cable quality, but it’s not clear what criteria are being used to trigger them.

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When I check the ports directly on the switch, I don’t see any anomalies.

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All Replies

  • Zyxel_Tina
    Zyxel_Tina Posts: 794 image  Zyxel Employee
    Zyxel Certified Network Administrator - Security Zyxel Certified Network Administrator - Switch 100 Answers 500 Comments

    Hi @Dylan96,

    To investigate further, could you please enable Zyxel Support Access and provide us your org/site name?

    Zyxel Tina

  • Dylan96
    Dylan96 Posts: 44 image  Freshman Member
    Zyxel Certified Network Administrator - Nebula Zyxel Certified Network Administrator - Security First Comment Friend Collector

    @Zyxel_Tina PM'd

  • EliteITGuy
    EliteITGuy Posts: 15 image  Freshman Member
    First Comment Fifth Anniversary

    We are seeing the same things for multiple clients. And it says issue and 60 seconds later it resolves. Zyxel any further info on this. We are on up to date firmware (stable) but not latest. Is it possible latest has this resolved?

  • Dylan96
    Dylan96 Posts: 44 image  Freshman Member
    Zyxel Certified Network Administrator - Nebula Zyxel Certified Network Administrator - Security First Comment Friend Collector

    @EliteITGuy no, all my switches are on latest fw

  • Zyxel_Tina
    Zyxel_Tina Posts: 794 image  Zyxel Employee
    Zyxel Certified Network Administrator - Security Zyxel Certified Network Administrator - Switch 100 Answers 500 Comments
    edited April 17

    [Update]

    This incident was caused by a known issue and is currently being addressed. We will keep you informed with further updates as soon as they are available.

    We appreciate your understanding and patience!

    Hi @EliteITGuy,

    "And it says issue and 60 seconds later it resolves." → Just to double-confirm, do you mean it also shows poor cable quality? If not, feel free to share a screenshot and your org/site name with us and enable Zyxel Support Access.

    Additionally, could you please confirm which switch models are affected by this issue and what their firmware versions are?

    Zyxel Tina

  • Zyxel_Tina
    Zyxel_Tina Posts: 794 image  Zyxel Employee
    Zyxel Certified Network Administrator - Security Zyxel Certified Network Administrator - Switch 100 Answers 500 Comments
    edited April 20

    Hi @Dylan96 and @EliteITGuy,

    We released a hotfix firmware update to address this issue. Could you please double-check if you have not received notifications in recent days?

    Zyxel Tina

  • Dylan96
    Dylan96 Posts: 44 image  Freshman Member
    Zyxel Certified Network Administrator - Nebula Zyxel Certified Network Administrator - Security First Comment Friend Collector

    @Zyxel_Tina Do we have to manually update to the new firmware? The issue is still present.

  • Dylan96
    Dylan96 Posts: 44 image  Freshman Member
    Zyxel Certified Network Administrator - Nebula Zyxel Certified Network Administrator - Security First Comment Friend Collector

    any updates?

  • Zyxel_Tina
    Zyxel_Tina Posts: 794 image  Zyxel Employee
    Zyxel Certified Network Administrator - Security Zyxel Certified Network Administrator - Switch 100 Answers 500 Comments

    Hi @Dylan96,

    Thank you for your feedback!

    After investigation, we confirm that the recent Port Advisor alerts you’re encountering are triggered by a flapping detection mechanism. Specifically, the system detected that the port status changed between UP and DOWN 5 times within a 1-minute interval.

    image.png

    We recommend starting your initial troubleshooting with the following steps:

    • Check the Physical Cable: Inspect the cable for any signs of damage or loose connection. Furthermore, try swapping it with other cables or connecting the device to a different port to see if the issue persists.
    • Verify the Client Device: Check if the connected client is experiencing power issues or network interface instability that could cause frequent link toggling.
    • Check PoE Power Budget: If the connected device is PoE-powered, please ensure the switch has sufficient power budget.

    Zyxel Tina

  • GiuseppeR
    GiuseppeR Posts: 726 image  Guru Member
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Engineer Level 1 - Nebula 5 Answers First Comment

    Hi @Zyxel_Tina

    I’m receiving similar alerts from different sites.

    Please could you confirm me that the bugfix (for the switches) is in rollout availability so I can accelerate the updates to check if I see the same amount of “poor cable quality” cables is going to zero also for us?

    Thanks in advance

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