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    Set a Timeout for DHCP Client Renewal Messages

    You can set the amount of time, in the range 1–168 hours, that the DHCP relay proxy waits for a renewal message from DHCP clients after a router reboot or switchover occurs. A renewal message is required from DHCP clients when a router reboot or switchover occurs. If no renewal message is received before the timeout expires, the relay proxy declares the client no longer active and removes the client’s host route By default, DHCP relay proxy uses timeout of 72 hours.

    host1(config)#set dhcp relay proxy timeout 8

    Note: DHCP relay proxy does not remove a DHCP client's host route when the lease for the client's IP address expires. DHCP relay proxy will instead remove the host route when the relay proxy timeout expires. To prevent a host route from remaining long after lease expiration, modify the relay proxy timeout from its default setting of 72 hours to a setting close to, but not less than the lease time.

    Published: 2014-08-20