TP-Link T1600G-28PS Jetstream Smart Switches User Guide - Page 514

Configuring DHCP Service Configuration Examples DHCP relay state: enabled ... DHCP relay helper address is configured on the following interfaces: Interface Helper address VLAN2 192.168.0.59 ... View port settings: Switch#show ip dhcp relay information interface Interface Option 82 Status Operation Strategy Format Circuit ID ... ... Gi1/0/1 Enable Replace Normal Default:VLAN-PORT ... Gi1/0/2 Enable Replace Normal Default:VLAN-PORT ... ... 5.4.4 Configuring the DHCP Server Note: •• Make sure the DHCP server supports Option 82 and more than one DHCP address pool. •• To make sure the DHCP server can reach the computers, you can create static routes or enable dynamic routing protocol like RIP on the DHCP server. •• In this section, we use different notations to distinguish ASCII strings from hexadecimal numbers. An ASCII string is enclosed with quotation marks, such as "123", while a hexadecimal number is divided by colon into parts of two digits, such as 31:32:33. On the DHCP server, you need to create two DHCP classes to identify the Option 82 payloads of DHCP request packets from Group 1 and Group 2, respectively. In this example, the DHCP relay agent uses the default circuit ID and remote ID in TLV format. According to packet formats described in Table 1-1 and Table 1-2, the sub-options of the two groups are as shown in the following table. Table 5-1 Sub-options of Group1 and Group 2 Group Sub-option Type (Hex) Length (Hex) Value (Hex) Circuit ID 00 04 00:02:00:01 1 Remote ID 00 06 00:00:FF:FF:27:12 User Guide 489