Copyright (c) 2026 MindMesh Academy. All rights reserved. This content is proprietary and may not be reproduced or distributed without permission.

5.6.1. DHCP Relay Configuration

Router(config)# interface GigabitEthernet0/0
Router(config-if)# ip helper-address 10.1.1.100

The relay agent:

  1. Receives DHCP broadcast on the interface
  2. Adds its interface IP to the gateway IP address (giaddr) field
  3. Forwards as unicast to the helper address
  4. Server uses giaddr to select the correct scope
Alvin Varughese
Written byAlvin Varughese•15 professional certifications