Tp-Link T2500-28TC V2 [159/342] Dhcp relay

148

Value

Message Type

DHCP-DISCOVER

DHCP-OFFER

DHCP-REQUEST

DHCP-DECLINE

DHCP-ACK

DHCP-NAK

DHCP-RELEASE

DHCP-INFORM

Table 9-1 Option 53

8) option 54：Server Identifier option. DHCP servers include option 54 in the DHCP-OFFER

message in order to allow the client to distinguish between lease offers. DHCP clients use

the option in a DHCP-REQUEST message to indicate which lease offers is being accepted.

9) option 55：Parameter Request List option. This option is used by a DHCP client to request

values for specified configuration parameters.

10) option 61：Client hardware address.

11) option 66：TFTP server name option. This option is used to identify a TFTP server.

12) option 67：Boot-file name option. This option is used to identify a boot-file.

13) option 150：TFTP server address option. This option is used to specify the address of the

TFTP server which assigns the boot-file to the client.

For particulars of DHCP option, please refer to RFC 2132.

9.1 DHCP Relay

The switch supports DHCP relay function, and in this section, DHCP relay function on this

switch will be introduced in detail.



Application Environment of DHCP Relay on T2500-28TC

In DHCP model, DHCP clients broadcast their DHCP requests, which requires the DHCP sever

and clients be in the same VLAN. Clients located in different VLANs with the DHCP server are

unable to obtain their IP addresses dynamically.

DHCP relay agent solves the problem. With the help of a relay agent, a DHCP client can request

an IP address from the DHCP server in another VLAN.



Details of DHCP Relay on T2500-28TC

A typical application of T2500-28TC working at DHCP Relay function is shown below. It can be

altered to meet the network requirement.