DHCP Relay feature forwards DHCP packets between client and server when the DHCP Server is not in the same broadcast domain as the client. DHCP Relay should be configured on the gateway interface (SVI/ L3 interface ) for the clients. DHCP Relay agent creates a new unicast DHCP packet and sets the giaddr field to the ‘primary’ IP address of the interface on which DHCP request packet is received. The modified request packet is then relayed to one or more configured DHCP servers. DHCP server assigns ip address to client from the pool corresponding to giaddr field.

EOS DHCP relay agent forwards all the DHCP requests from the clients using the primary IP address of the interface as

In VXLAN networks, broadcast DHCP requests are head-end-replicated to all VXLAN tunnel endpoints (VTEP). If a DHCP relay helper address is configured on more than one VTEP, each such VTEP relays the DHCP request to the configured DHCP server. This could potentially overwhelm the DHCP server as it would receive multiple copies of broadcast packets originated from a host connected to one of the VTEPs.