XGS1935-28 loosing parts of settings after a reboot

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Tzunami
Tzunami Posts: 32 image  Freshman Member
First Comment Friend Collector Fourth Anniversary
edited January 4 in Switch

The Switch is in standalone mode.
Boot Version ZyNOS F/W Version
V1.00 | 05/30/2024 V4.90(ACJW.0) | 07/02/2024

When I reboot, some Switch settings get lost.

All Green Ethernet settings are set to off. Was on while save config
Also the CPU Protection settings are disabled.

Bug or feature?

EDIT_1: I see there is a newer firmware.

EDIT_2: Same problem, CPU Protection and Green Ethernet disabled after reboot with V4.90(ACJW.2).

All Replies

  • Zyxel_Tina
    Zyxel_Tina Posts: 529 image  Zyxel Employee
    Zyxel Certified Network Administrator - Security Zyxel Certified Network Administrator - Switch 100 Answers 500 Comments
    edited January 6

    Hi @Tzunami,

    When your XGS1935 switch loses settings after a reboot, it's typically because the running configuration wasn't saved to the startup configuration.

    From my testing after making changes (like Green Ethernet or CPU Protection settings), clicking Apply followed by Save successfully stores the configuration. The settings persist after reboot with no issues.

    In standalone mode, after making any changes, you must click the "Save" button on the top navigation panel.

    image.png

    This action writes the current running configuration to the startup configuration, ensuring that your settings persist after a reboot. If you only click Apply to save changes, they will be stored only in run-time memory and lost when the switch is turned off or loses power. Therefore, please ensure you save your config correctly.

    Zyxel Tina

  • Tzunami
    Tzunami Posts: 32 image  Freshman Member
    First Comment Friend Collector Fourth Anniversary
    edited January 6
  • Tzunami
    Tzunami Posts: 32 image  Freshman Member
    First Comment Friend Collector Fourth Anniversary
    edited January 6
    https://community.zyxel.com/en/discussion/comment/82533#Comment_82533

    Negative! This is exactly what I do.
    For information, NCC is completely disabled (disabled directly as first and i have not used one of the qr codes).

    Bildschirmfoto 2026-01-06 um 19.34.03.jpg

    I download the settings with configuration backup and all is inside the file.
    But when I restart the switch, I get the wizzard (who was also disabled) and the described funtions are set to OFF.

    Here a part of the config file backup:
    Product Name = XGS1935-28
    ; Firmware Version = V4.90(ACJW.2) | 08/28/2025
    ; SysConf Engine Version = 1.2
    ; Config last updated = 19:16:03 (UTC+01:00) 2026-01-06

    …
    interface port-channel 1
    name "USG Flex 200"
    qos priority 1
    broadcast-limit
    broadcast-limit 1000
    loopguard
    cpu-protection cause ARP rate-limit 192
    cpu-protection cause BPDU rate-limit 192
    cpu-protection cause IGMP rate-limit 192
    green-ethernet eee
    green-ethernet auto-power-down
    green-ethernet short-reach
    exit
    interface port-channel 2
    qos priority 1
    broadcast-limit
    broadcast-limit 1000
    loopguard
    cpu-protection cause ARP rate-limit 192
    cpu-protection cause BPDU rate-limit 192
    cpu-protection cause IGMP rate-limit 192
    green-ethernet eee
    green-ethernet auto-power-down
    green-ethernet short-reach
    exit

  • Zyxel_Tina
    Zyxel_Tina Posts: 529 image  Zyxel Employee
    Zyxel Certified Network Administrator - Security Zyxel Certified Network Administrator - Switch 100 Answers 500 Comments

    Hi @Tzunami,

    To help us reproduce the issue and investigate further, could you please collect the TechSupport Info file and provide it to us via private message?

    [Switch] How to collect the Tech-support Info on V4.80 firmware version and newer? — Zyxel Community

    Zyxel Tina

  • Tzunami
    Tzunami Posts: 32 image  Freshman Member
    First Comment Friend Collector Fourth Anniversary
    https://community.zyxel.com/en/discussion/comment/82644#Comment_82644

    Sended the file to you.

  • Tzunami
    Tzunami Posts: 32 image  Freshman Member
    First Comment Friend Collector Fourth Anniversary
    edited January 10
    https://community.zyxel.com/en/discussion/comment/82644#Comment_82644

    Looks like I found a funny bug inside your software.

    The problem inside the thread is only present if you don't complete the wizard one time for the config. After using the wizard, the config is working normally. If you now load a config that was created without the finished wizard, you get this problem again.

    Example:

    config 1 (wizard compleeted): all settings working well.

    reboot into config 2 (wizard never used): Green Ethernet, Errdisable Detect disabled.

    Activate Green Ethernet, Errdisable Detect and save to config 2

    reboot into config 2 (wizard never used): Green Ethernet, Errdisable Detect disabled.

    reboot into config 1 (wizard completed): all settings working well.

    reboot into config 2 (wizard never used): Green Ethernet… disabled

    Now complete the wizzard in config 2 (you will loose some setting you made before). After this you can activate Green Ethernet, Errdisable Detect and make your settings, and all will be working well.

    EDIT: I'm going crazy.

    If you now use the wizard again (I have used VLAN) you will loose some settings and get back the problem for all your configs.

  • Tzunami
    Tzunami Posts: 32 image  Freshman Member
    First Comment Friend Collector Fourth Anniversary

    Command back, Forget the last post. I have found the problematic setting!

    This disables Green Ethernet, Errdisable Detect!

    Bildschirmfoto 2026-01-10 um 14.52.15.jpg

    If you have a single address, it must be set up like this, or you've got my problems:

    Bildschirmfoto 2026-01-10 um 14.52.01.jpg

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