Example for Configuring a Device as the DHCP Relay Agent (Connected to the DHCP Server Across a BGP/MPLS IP VPN Tunnel) - AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600
What Is DHCP Relay Agent? Detailed Explanation
Configure the router as a DHCP relay agent | Eslam Daoud