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# Synchronizing the DHCP External Application and the Router

In some cases the router and the DHCP external application might not be synchronized. For example, an unsynchronized condition might occur when you first enable the DHCP external server application. You can resynchronize and create subscriber state information that is based on lease renewals.

To synchronize the external DHCP server with the E-series router:

- Issue the ip dhcp-external server-sync command from Global Configuration mode:
  `
  host1(config)#ip dhcp-external server-sync
  `

#### Related Topics

- ip dhcp-external server-sync

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