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Multiple DHCP servers are detected Reply

User 71496

Level 1

Multiple DHCP servers are detected
21 1 2025-7-13 03:11:04
Original
[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?
Ruijie Cloud

Ruijie Cloud
0 2025-7-13 09:10:13 View all replies
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


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