GS1920-8HP V5.00(ABKZ.2) - LACP NOT working

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GiuseppeR
GiuseppeR Posts: 664 image  Master Member
Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Engineer Level 1 - Nebula 5 Answers First Comment
in Switch

Hello everyone,

I installed a GS1920-8HP to communicate with a XGS1930-52HP.

On the big one I setup a LACP link on these ports (45-48):

immagine.png

While on the small one I setup a LACP link on these ports (1-4):

immagine.png

There is no way that I can use these ports (1-4) when I attach a cable from port 45 to port1, neither port2 and so on.

As you can see the GS1920-8HP is working only using port5 as uplink.

I tried to use Reprovision, no change.

I tried to split and relink the LACP group, no change.

Just to let you know, when I split the LACP the link 45<>1 was working, also the link 45<>2 was working so the cables are OK, there is an issue with LACP link on this switch.

Please let me know how to solve this issue.

All Replies

  • Zyxel_Melen
    Zyxel_Melen Posts: 4,616 image  Zyxel Employee
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate

    Hi @GiuseppeR

    After reviewing via remote SSH, we found that the LACP configuration was not properly synchronized in the running configuration of the neighboring switch (XGS1930).
    Please try the following steps:

    1. On NCC, disable LACP on ports 45–48 on the XGS1930 and save the configuration.
    2. On NCC, enable LACP again on ports 45–48 on the XGS1930 and save the configuration.
    3. Use "Reprovision" for the XGS1930
    4. Reconnect the cable between the switches(1920 and 1930) with the correct ports and check whether the LACP link establishes correctly.

    In addition, the GS1920 will have a short disconnection after configure LACP on XGS1930 since its uplink is correctly connecting to XGS1930 port 45, which will be the LACP member port. It will be online after step 4.

    Please let us know the result after performing the above steps. Thank you for your cooperation.

    Zyxel Melen


  • GiuseppeR
    GiuseppeR Posts: 664 image  Master Member
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Engineer Level 1 - Nebula 5 Answers First Comment

    HI @Zyxel_Melen

    everything works perfect right now with your procedure.

    So next time that LACP will not work properly do you suggest to rebuild both LACP?

    Is there something that I can check like you have done to see a misalignment in setup betweeen Nebula and onsite hardware?

    Thanks

  • Zyxel_Melen
    Zyxel_Melen Posts: 4,616 image  Zyxel Employee
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate

    Hi @GiuseppeR

    You may access the switch local GUI to check if the configuration is set. GS1920 and XGS1930 are able to access device's local GUI to check LACP settings on V5.00 firmware (and after).

    For other models which firmware version aren't V5.00, you need to SSH to the device and use command "show running-config"

    The LACP configuration is like:

    lacp
    
trunk T1
    
trunk T1 lacp
    
trunk T1 interface 7
    
trunk T1 interface 8
    Zyxel Melen


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