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Dell EMC SmartFabric OS10 User Guide Release 10.5.2

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Option-82 with the Client and the Server in same VLAN

In this topology, Host1, Host2, and Host3 are the DHCP clients connected to the DHCP-relay-enabled switch. The DHCP clients and the DHCP server are part of same VLAN 100.

In this scenario, the DHCP-relay-enabled switch floods the DHCP packets from the DHCP client and also forwards the DHCP packets with Option-82 set in the DHCP packet header to the DHCP server.

If you configured Option-82, the DHCP server allocates the IP address based on the options present in Option-82. Otherwise, the DHCP server allocates the IP address with the on-link subnet.

If you disable Option-82 in the DHCP relay switch, the DHCP packet from the client forward without Option-82 and the DHCP server allocates the IP address from the on-link subnet value.

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