Accton Technology ES4626 - Manual (Page 331)

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DHCP frame format, please refer to RFC2131).
2. On the receiving the DHCPDISCOVER packets forwarded by DHCP relay, the
DHCP server sends the DHCPOFFER packet via DHCP relay to the DHCP client.
3. DHCP client chooses a DHCP server and broadcasts a DHCPREPLY packet,
DHCP relay forwards the packet to the DHCP server after processing.
4. On receiving DHCPREPLY, the DHCP server responds with a DHCPACK packet
via DHCP relay to the DHCP client.
DHCP relay can not only send DHCP broadcasting packets to the specified DHCP
servers, but can also send other specified UDP broadcast packet to specified servers.
10.3.1 DHCP Relay Configuration Task List
1. Enable DHCP relay.
2. Configure DHCP relay to forward DHCP broadcast packet.
3. Configure DHCP relay to forward other UDP broadcast packet.
4. Disable DHCP relay from forwarding DHCP broadcast packet.
1. Enable DHCP relay.
DHCP server and DHCP relay is enabled as the DHCP service is enabled..
2. Configure DHCP relay to forward DHCP broadcast packet.
Command Explanation
Global Mode
ip forward-protocol udp <port>
no ip forward-protocol udp <port>
The UDP port 67 is used for DHCP broadcast
packet forwarding.
Interface Mode
ip helper-address <ipaddress>
no ip helper-address <ipaddress>
Set the destination IP address for DHCP relay
forwarding; the “no ip helper-address
<ipaddress>“ command cancels the setting.
3. Configure DHCP relay to forward other UDP broadcast packet.
Command Explanation
Global Mode
ip forward-protocol udp <port>
no ip forward-protocol udp <port>
Specify the DHCP relay forwarding protocol
by setting UDP port; the “no ip
forward-protocol udp <port>“ command
cancels the setting.
ip helper-address <ipaddress>
no ip helper-address <ipaddress>
Set the destination IP address for DHCP relay
forwarding; the “no ip helper-address
<ipaddress>“ command cancels the setting.
4. Disable DHCP relay from forwarding DHCP broadcast packet.