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zbrvenik
zbrvenik
New Member
February 12, 2025
Question

DHCP Helper on Standalone FortiSwitch

  • February 12, 2025
  • 3 replies
  • 1185 views

We currently purchased some FortiSwitch 124F-FPOE switches for a client and are running into some odd issues getting the DHCP Helper feature to work properly.

 

DHCP Server exists at a central office with a bunch of branches connected to it via MPLS. So a hub and spoke topology, where all traffic from the branch sites is funneled back to the main office.

 

For whatever reason when we are using a FortiSwitch at one of these branch locations, the DHCP Helper function doesn't work properly on VLANs. The native vlan on the internal interface will forward the DHCP traffic, but the other DHCP Helper on VLAN10 will not forward DHCP traffic correctly.

I have confirmed routing is working properly because I can statically assign a device on VLAN10 and ping the DHCP server with no issue. There is nothing that would block this traffic.


Currently have a case open with TAC and they aren't able to resolve the issue either, wondering if anyone else has run into this issue?

 

I've tried running various different versions of FortiSwitchOS (7.2.x, 7.4.x, 7.6.x), and I get the same behavior from all of them.

3 replies

Anthony_E
Staff
Anthony_E
Staff
February 17, 2025

Hello,


Thank you for using the Community Forum. I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible.


Thanks,

Best Regards
Anthony_E
Staff
Anthony_E
Staff
February 19, 2025

Hello,

 

We are still looking for someone to help you.

We will come back to you ASAP.


Regards,

Best Regards
Anthony_E
Staff
Anthony_E
Staff
February 20, 2025

Hi,

 

To configure DHCP helper on a standalone FortiSwitch:

  1. Access the FortiSwitch CLI or GUI interface.
  2. Enable DHCP relay or helper functionality.
  3. Specify the IP address of the DHCP server to which DHCP requests will be forwarded.
  4. Configure the VLAN settings if the DHCP relay is enabled per VLAN.
  5. Verify the DHCP relay settings and ensure they match the network requirements.

 

Hope it will help.

 

Regards,

Best Regards
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