Disable sending LLDP to ISP over fiber link

peos42
peos42 Posts: 18  Freshman Member
First Comment Friend Collector
in Switch

Hi

Sorry for my intensive posting. I am new on modern Zyxel switches and syntax differs a little bit against what I am used to :) Trying to make sure the new Zyxel switch will do what I expect it to before make it production active.

Instead of doing this on the fiber port interface to the ISP…

no lldp basic-tlv management-address
no lldp basic-tlv port-description
no lldp basic-tlv system-capabilities
no lldp basic-tlv system-description
no lldp basic-tlv system-name
no lldp org-specific-tlv dot1 port-vlan-id
no lldp org-specific-tlv dot3 mac-phy


can I use...

lldp admin-status rx-only

or

lldp admin-status disabled

And be *sure* no lldp is sent out to the ISP?

Tnx in advance

//Peo

Accepted Solution

  • Zyxel_Kay
    Zyxel_Kay Posts: 1,204  Zyxel Employee
    Zyxel Certified Network Engineer Level 2 - Nebula Zyxel Certified Network Engineer Level 2 - WLAN Zyxel Certified Network Engineer Level 2 - Switch Zyxel Certified Network Engineer Level 2 - Security
    Answer ✓

    Hi @peos42

    Yes, you can use the lldp admin-status rx-only command to configure the interface to only receive LLDP packets, or lldp admin-status disabled to ensure that the interface neither sends nor receives LLDP packets. Both options will prevent LLDP packets from being sent to your ISP.

    If you prefer a graphical approach, you can adjust these settings via the web interface. Simply navigate to PORT > LLDP > LLDP Setup to modify the LLDP configuration for the specific interface.

    image.png

    Kay

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All Replies

  • Zyxel_Kay
    Zyxel_Kay Posts: 1,204  Zyxel Employee
    Zyxel Certified Network Engineer Level 2 - Nebula Zyxel Certified Network Engineer Level 2 - WLAN Zyxel Certified Network Engineer Level 2 - Switch Zyxel Certified Network Engineer Level 2 - Security
    Answer ✓

    Hi @peos42

    Yes, you can use the lldp admin-status rx-only command to configure the interface to only receive LLDP packets, or lldp admin-status disabled to ensure that the interface neither sends nor receives LLDP packets. Both options will prevent LLDP packets from being sent to your ISP.

    If you prefer a graphical approach, you can adjust these settings via the web interface. Simply navigate to PORT > LLDP > LLDP Setup to modify the LLDP configuration for the specific interface.

    image.png

    Kay

    Untitled Image

    See how you've made an impact in Zyxel Community this year! https://bit.ly/Your2024Moments_Community

  • peos42
    peos42 Posts: 18  Freshman Member
    First Comment Friend Collector

    Tnx for the reply. I was a little bit confused because it was named "no lldp" on the switch level, but on the interface level the ekvivalent was "lldp admin-status disabled".

    But I will probably go for just receiving with "lldp admin-status rx-only" from the ISP on the fiber port :)

    Tnx @Zyxel_Kay

  • Zyxel_Kay
    Zyxel_Kay Posts: 1,204  Zyxel Employee
    Zyxel Certified Network Engineer Level 2 - Nebula Zyxel Certified Network Engineer Level 2 - WLAN Zyxel Certified Network Engineer Level 2 - Switch Zyxel Certified Network Engineer Level 2 - Security

    Hi @peos42

    On the interface level, there are four options for the LLDP admin status: disabled, tx-only, rx-only, and tx-rx. Using the command lldp admin-status disabled disables LLDP entirely for that specific interface.

    At the switch level, however, the no lldp command is used to disable the LLDP function globally for the entire switch.

    I hope this clears up the confusion! Feel free to reach out if you have any more questions.

    Kay

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    See how you've made an impact in Zyxel Community this year! https://bit.ly/Your2024Moments_Community

  • peos42
    peos42 Posts: 18  Freshman Member
    First Comment Friend Collector

    Yes. Now it is clear to me. It is just ZynOS that confuses me a bit. I would have expected "no lldp" on the interface level as well and not a different syntax like "lldp admin-status disabled" as it has the same meaning as "no lldp". I think disabling it on the switch and the interface would be the same syntax.

    I also had problem to find "shutdown" and "no shutdown" on the interface, but just after looking for it, I saw you named if differently (inactive).

    But… I am getting used to it. Working on it 🙂

    Tnx

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