77[Router-Ethernet1/2] dhcp snooping binding record[Router-Ethernet1/2] quitVerifying the configurationAfter the preceding configuration is complete, the DHCP client can obtain an IP address and otherconfiguration parameters only from the authorized DHCP server. You can view the DHCP snooping entryrecorded for the client with the display dhcp snooping binding command.Option 82 configuration exampleNetwork requirementsAs shown in Figure 28, enable DHCP snooping and configure Option 82 on the Router as follows:• Configure the handling strategy for DHCP requests that contain Option 82 as replace.• On Ethernet 1/2, configure the padding content for the circuit ID sub-option as company001 andfor the remote ID sub-option as device001.• On Ethernet 1/3, configure the padding format as verbose, access node identifier as sysname,and code type as ascii for Option 82.Figure 28 Network diagramConfiguration procedure# Enable DHCP snooping. system-view[Router] dhcp snooping enable# Configure Ethernet 1/1 as a trusted port.[Router] interface ethernet 1/1[Router-Ethernet1/1] dhcp snooping trust[Router-Ethernet1/1] quit# Configure Option 82 on Ethernet 1/2.[Router] interface ethernet 1/2[Router-Ethernet1/2] dhcp snooping information enable[Router-Ethernet1/2] dhcp snooping information strategy replace[Router-Ethernet1/2] dhcp snooping information circuit-id string company001[Router-Ethernet1/2] dhcp snooping information remote-id string device001[Router-Ethernet1/2] quit# Configure Option 82 on Ethernet 1/3.
