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Knowledge Base

VMC DHCP relay configuration changes do not take affect (75191)

Last Updated: 5/6/2020Categories: TroubleshootingTotal Views: 5686Language:
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Symptoms

After initial DHCP configuration no further changes to target DHCP servers take affect

Though the UI shows the correct IP for the DHCP relay requests, the requests continue to go to a previously configured DHCP server

Resolution

SDDC version M9/ M10:

Network Administrator will need to change the segment Type to “disconnect”  all the network segments with DHCP during maintenance window

Change the DHCP server details in  “DHCP relay” section.

Change network segments type back to  “Routed”

On guest VM’s, DHCP release/renew will need to be performed to update the IP lease with the newer DHCP servers.

SDDC version M8 and earlier:

Disconnect all the VM’s network interface attached to the DHCP logical networks

Delete the logical networks

Make changes to DHCP relay config with new DHCP Server address

Recreate DHCP logical networks and attach their VM’s

Workaround

In use cases where the environment cannot take the downtime to update the DHCP server please contact VMware support to discuss possible workarounds.

Detectable by VMware SkylineTM

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