Configuring DHCP VLAN Relay
DHCP VLAN Relay
Configuration Guide
435
1
DHCP VLAN Relay
1.1 Overview
Since the DHCP client requests a dynamic IP address via broadcast, the basic network
model of DHCP requires that the client and the server should be on the same LAN (on the
same subnet and VLAN). Therefore, each LAN should be equipped with a DHCP server,
thus increasing the costs of network construction.
DHCP VLAN relay helps DHCP clients to obtain IP addresses when these clients are in
different VLANs with the DHCP server.
The switch with DHCP VLAN Relay enabled acts as a relay agent between the DHCP client
and the DHCP server. If the client and the DHCP server are not in the same VLAN, the
switch will forward the client’s requests to the DHCP server through the default agent
interface, and forward the DHCP server’s response to the client. Through this mechanism,
the client can get IP addresses from the DHCP server.
For T2500G-10MPS, you can set the management VLAN as the default agent interface and
specify the VLANs that can use the default agent interface to get IP addresses from the
DHCP server.
For example, as the following figure shows, you can configure that only the clients in VLAN
10 and VLAN 20 can get IP addresses from the DHCP server but the clients in VLAN 30
cannot.
Figure 1-1
Application Scenario of DHCP VLAN Relay
DHCP Server
192.168.1.1/24
DHCP Clients
VLAN 10
192.168.1.0/24
DHCP Clients
VLAN 20
192.168.1.0/24
Other Hosts
VLAN 30
Switch
DHCP Relay
Summary of Contents for T2500G-10MPS
Page 1: ...User Guide T2500G 10MPS 1910012405 REV1 0 1 April 2018...
Page 24: ...Using the CLI 767 Appendix Default Parameters 773...
Page 145: ...Part 5 Monitoring Traffic CHAPTERS 1 Traffic Monitor 2 Appendix Default Parameters...
Page 172: ...Part 7 Configuring DDM CHAPTERS 1 Overview 2 DDM Configuration 3 Appendix Default Parameters...
