Multiple DHCP servers are detected

[strong]Multiple DHCP servers are detected on device G1T07HW001729:[/strong]

• A DHCP server is detected on [strong]port 18[/strong], IP:
  192.168.110.1
  , MAC:
  98:4A:6B:9D:A7:0A
  , VLAN ID:
  1
  
  
• A second DHCP server is also detected on [strong]port 18[/strong], IP:
  192.168.20.1
  , MAC:
  98:4A:6B3:33:6
  , VLAN ID:
  20
  
  
  

❓[strong]Why does this happen every time I delete VLAN 20 and recreate it?[/strong]
It seems that after recreating VLAN 20, a new SVI interface and DHCP service are automatically created on the switch, causing DHCP conflicts.
How can I prevent this behavior?

Dear customer,
When creating a VLAN, you can disabled the DHCP pool for the VLAN. You can refer to the guide below regarding more details.
https://cloud.ruijienetworks.com/help/#/ArticleList?id=e945f0446ace466b86542e2610c1c96f




You can also disable the DHPC pool on an existing SVI in the device config page. The alarm in your project will be cleared about 9 minutes later after the issue is resolved

GTAC-Ryan replied at 2025-7-13 09:10
Dear customer,
When creating a VLAN, you can disabled the DHCP pool for the VLAN. You can refer to t ...

VLAN 10 is for AP Wi-Fi. After I disabled the SVI, my phone could no longer obtain an IP address.

User 71496 replied at 2025-7-15 16:56
VLAN 10 is for AP Wi-Fi. After I disabled the SVI, my phone could no longer obtain an IP address.
...

SORRY VLAN20

User 71496 replied at 2025-7-15 19:39
SORRY VLAN20

Dear customer,
We will need to check the network via project sharing. Therefore, to share the the project in a secured channel, we  encourage you to contact us on Rita(www.ruijienetworks.com/rita), our real-time support platform. Our dedicated engineers are readily available to resolve your issues promptly.
You can click "Live Chat" on the top right corner of the page to contact our engineer.