topic Re: X440 DHCP Set up in ExtremeSwitching (EXOS/Switch Engine)

X440 DHCP Set up

rjgivens — Wed, 12 Mar 2025 21:35:00 GMT

I have 9 X440 in a network, with one acting as the "main switch", and have Unifi access points attached to the various switches. I am trying to make it so the "Main Switch" is the DHCP server for each of our vlans on all switches. I have configured DHCP etc on each VLAN, and assigned the trunk ports to the dhcp. In unifi controller, I have created networks that correspond with each vlan, but when I connect via wifi, I still get a self assigned IP. What am I missing here?

Re: X440 DHCP Set up

Gabriel_G — Thu, 13 Mar 2025 15:45:47 GMT

Hi!

I don't think we have enough information to give you an exact answer, but here is a helpful guide with all needed commands:
https://extreme-networks.my.site.com/ExtrArticleDetail?an=000082555

Be sure that the DHCP components are not only configured, but also DHCP is enabled on the relevant port/VLAN with the 'enable dhcp port ...> command.

As a test, if you give the client a static IP/Subnet mask, can it ping the switch IP in the same VLAN?
If not, you may have a layer 2 issue, or an issue with IP configuration.

Hope that helps!

Re: X440 DHCP Set up

rjgivens — Thu, 13 Mar 2025 23:10:50 GMT

What other information would be helpful to provide?

Re: X440 DHCP Set up

rjgivens — Thu, 13 Mar 2025 23:18:36 GMT

I have everything set up as stated in the guide you posted - only difference is I set it up via the web UI and not the CLI.

Re: X440 DHCP Set up

rjgivens — Fri, 14 Mar 2025 19:38:18 GMT

Turns out, I had it set up correctly. Someone had plugged 2 cat5 and a fiber on the same vlan between 2 of our switches.

Re: X440 DHCP Set up

nick533 — Sat, 15 Mar 2025 05:52:33 GMT

It sounds like the issue may lie in either the VLAN configuration on the Unifi access points or the trunking setup between the switches and access points. Make sure the trunk ports between the switches and access points are properly tagged for each VLAN. Additionally, ensure that the Unifi access points are correctly set up to allow the DHCP request to reach the main switch. In the Unifi controller, double-check that each network is associated with the correct VLAN ID and that DHCP relay (if used) is properly configured. If you're using multiple DHCP scopes, verify that the correct scope is applied to each VLAN on the main switch.

Re: X440 DHCP Set up

Miguel-Angel_RO — Sun, 16 Mar 2025 19:56:43 GMT

Difficult to help with the description of you GUI experience...

Post your config, we can have a look