42DHCP relay agent Option 82 support configuration exampleNetwork requirements• As shown in Figure 11 on page 41, enable Option 82 on the DHCP relay agent (Switch A).• 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 IDsub-option as device001.• Switch A forwards DHCP requests to the DHCP server after replacing Option 82 in the requests, sothat the DHCP clients can obtain IP addresses.Configuration procedureSpecify IP addresses for the interfaces (detailed steps not shown).Enable DHCP. system-view[SwitchA] dhcp enableAdd DHCP server 10.1.1.1 into DHCP server group 1.[SwitchA] dhcp relay server-group 1 ip 10.1.1.1Enable the DHCP relay agent on VLAN-interface 1.[SwitchA] interface vlan-interface 1[SwitchA-Vlan-interface1] dhcp select relayCorrelate VLAN-interface 1 to DHCP server group 1.[SwitchA-Vlan-interface1] dhcp relay server-select 1Enable the DHCP relay agent to support Option 82, and perform Option 82-related configurations.[SwitchA-Vlan-interface1] dhcp relay information enable[SwitchA-Vlan-interface1] dhcp relay information strategy replace[SwitchA-Vlan-interface1] dhcp relay information circuit-id string company001[SwitchA-Vlan-interface1] dhcp relay information remote-id string device001You need to perform corresponding configurations on the DHCP server to make the Option 82 configurationsfunction normally.Troubleshooting DHCP relay agent configurationSymptomDHCP clients cannot obtain any configuration parameters via the DHCP relay agent.
