4-11Network diagramFigure 4-6 Network diagram for DHCP-snooping Option 82 support configurationConfiguration procedure# Enable DHCP snooping on the switch. system-view[Switch] dhcp-snooping# Specify GigabitEthernet 1/0/5 as the trusted port.[Switch] interface GigabitEthernet1/0/5[Switch-GigabitEthernet1/0/5] dhcp-snooping trust[Switch-GigabitEthernet1/0/5] quit# Enable DHCP-snooping Option 82 support.[Switch] dhcp-snooping information enable# Set the remote ID sub-option in Option 82 to the system name (sysname) of the DHCP snoopingdevice.[Switch] dhcp-snooping information remote-id sysname# Set the circuit ID sub-option in DHCP packets from VLAN 1 to abcd on GigabitEthernet 1/0/3.[Switch] interface GigabitEthernet1/0/3[Switch-GigabitEthernet1/0/3] dhcp-snooping information vlan 1 circuit-id string abcdIP Filtering Configuration ExampleNetwork requirementsAs shown in Figure 4-7, GigabitEthernet 1/0/1 of the S5600 switch is connected to the DHCP serverand GigabitEthernet 1/0/2 is connected to Host A. The IP address and MAC address of Host A are1.1.1.1 and 0001-0001-0001 respectively. GigabitEthernet 1/0/3 and GigabitEthernet 1/0/4 areconnected to DHCP Client B and Client C.z Enable DHCP snooping on the switch, and specify GigabitEthernet 1/0/1 as the DHCP snoopingtrusted port.
