SNR S2989G-8TX [204/553] Dhcp configuration examples
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SNR S2989G-8TX [204/553] Dhcp configuration examples

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SNR S2989G-24TX-POE [204/553] Dhcp configuration examples
S2989G-24TX Operation Manual
Chapter 3 IP services Configuration
3-42
The client broadcasts a DHCPDISCOVER packet, and DHCP relay inserts its own
IP address to the relay agent field in the DHCPDISCOVER packet on receiving
the packet, and forwards the packet to the specified DHCP server (for DHCP
frame format, please refer to RFC2131).
On the receiving the DHCPDISCOVER packets forwarded by DHCP relay, the
DHCP server sends the DHCPOFFER packet via DHCP relay to the DHCP client.
DHCP client chooses a DHCP server and broadcasts a DHCPREQUEST packet,
DHCP relay forwards the packet to the DHCP server after processing.
On receiving DHCPREQUEST, the DHCP server responds with a DHCPACK
packet via DHCP relay to the DHCP client.
DHCP Relay Configuration Task List:
1. Enable DHCP relay.
2. Configure DHCP relay to forward DHCP broadcast packet.
1. Enable DHCP relay.
Command
Explanation
Global Mode
service dhcp
no service dhcp
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 bootps
no ip forward-protocol udp
bootps
The UDP port 67 is used for DHCP broadcast
packet forwarding.
Interface Configuration 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.
3.14.4
DHCP Configuration Examples
Scenario 1:
Too save configuration efforts of network administrators and users, a company is
using switch as a DHCP server. The Admin VLAN IP address is 10.16.1.2/16. The local
area network for the company is divided into network A and B according to the office
locations. The network configurations for location A and B are shown below.
PoolA(network 10.16.1.0)
PoolB(network 10.16.2.0)

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