HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Services Conf - Page 52
Configuration procedure, DHCP relay agent Option 82 support configuration example
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Figure 30 Network diagram DHCP client DHCP client Vlan-int1 10.10.1.1/24 Vlan-int2 10.1.1.2/24 Switch DHCP relay agent DHCP server IP:10.1.1.1/24 DHCP client DHCP client Configuration procedure The DHCP relay agent and server are on different subnets, so configure a static route or dynamic routing protocol to make them reachable to each other. Configurations on the DHCP server are also required to guarantee the client-server communication via the DHCP relay agent. # Specify IP addresses for the interfaces. (Details not shown.) # Enable DHCP. system-view [Switch] dhcp enable # Add DHCP server 10.1.1.1 into DHCP server group 1. [Switch] dhcp relay server-group 1 ip 10.1.1.1 # Enable the DHCP relay agent on VLAN-interface 1. [Switch] interface vlan-interface 1 [Switch-Vlan-interface1] dhcp select relay # Correlate VLAN-interface 1 to DHCP server group 1. [Switch-Vlan-interface1] dhcp relay server-select 1 After the preceding configuration is complete, DHCP clients can obtain IP addresses and other network parameters through the DHCP relay agent from the DHCP server. You can use the display dhcp relay statistics command to view statistics of DHCP packets forwarded by DHCP relay agents. After you enable address check of the DHCP relay agents with the dhcp relay address-check enable command, use the display dhcp relay security command to view bindings of DHCP relay agents DHCP relay agent Option 82 support configuration example Network requirements • As shown in Figure 30, enable Option 82 on the DHCP relay agent. • Configure the handling strategy for DHCP requests containing Option 82 as replace. • Configure the padding content for the circuit ID sub-option as company001 and for the remote ID sub-option as device001. • Switch forwards DHCP requests to the DHCP server after replacing Option 82 in the requests, so that the DHCP clients can obtain IP addresses. 44