TP-Link T2500-28TCTL-SL5428E T2500-28TCUN V1 User Guide - Page 148
DHCP Relay, Application Environment of DHCP Relay on T2500-28TC
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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. Figure 9-5 DHCP Relay Application To allow all clients in different VLANs request IP address from one server successfully, the DHCP Relay function can transmit the DHCP packets between clients and server in different VLANs. When receiving DHCP-DISCOVER and DHCP-REQUEST packets, the switch will fill the giaddr field with its own management IP address, optionally insert the option 82 information, and then forward the packet to the server. 138