A10E/A28E/A28F Configuration Guide
Checking results
Check whether DHCP client configuration is correct by the command of show ip dhcp client.
Alpha-A28E#show ip dhcp client
Hostname: alpha-a28e
Class-ID: alpha-a28eFTTH-ROS_4.14.1727
Client-ID: alpha-a28eFTTH-000e5e123456-IF0
DHCP Client is requesting for a lease.
3.5 DHCP Relay
3.5.1 Introduction
At the beginning, DHCP requires that the DHCP server and clients must be in the same
network segment. As a result, a DHCP server is configured for all network segments for
dynamic host configuration, which is not economic.
DHCP Relay is introduced to solve this problem. It can provide relay service between DHCP
clients and DHCP server that are in different network segments. It relays packets across
network segments to the DHCP server or clients.
The working principle of DHCP Relay is shown below.
Figure 3-7 DHCP Relay application networking
Step 1 The DHCP client sends a request packet to the DHCP server.
Step 2 After receiving the packet, the DHCP relay device process the packet in a certain way, and
then sends it to the DHCP server on the specified network segment.
Step 3 The DHCP server sends acknowledgement packet to the DHCP client through the DHCP
relay device according to the information contained in the request packet. In this way, the
configuration of the DHCP client is dynamically configured.
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