Prerequisites for DHCP relay operation

For the DHCP relay agent to work on the switch, you must complete the following steps:

  1. Enable DHCP relay on the routing switch (the default setting.)
  2. Ensure that a DHCP server is servicing the routing switch.
  3. Enable IP routing on the routing switch.
  4. Ensure that there is a route from the DHCP server to the routing switch and back.
  5. Configure one or more IP helper addresses for specified VLANs to forward DHCP requests to DHCP servers on other subnets.