4-8[SwitchB-GigabitEthernet1/0/1] dhcp-snooping trust[SwitchB-GigabitEthernet1/0/1] quitDHCP Snooping Option 82 Support Configuration ExampleNetwork requirementsz As shown in Figure 4-3, enable DHCP snooping and Option 82 support on Switch B.z Configure the handling strategy for DHCP requests containing Option 82 as replace.z On GigabitEthernet 1/0/2, configure the padding content for the circuit ID sub-option ascompany001 and for the remote ID sub-option as device001.z On GigabitEthernet 1/0/3, configure the padding format as verbose, access node identifier assysname, and code type as ascii for Option 82.z Switch B forwards DHCP requests to the DHCP server after replacing Option 82 in the requests, sothat the DHCP clients can obtain IP addresses.Configuration procedure# Enable DHCP snooping. system-view[SwitchB] dhcp-snooping# Specify GigabitEthernet 1/0/1 as trusted.[SwitchB] interface gigabitethernet 1/0/1[SwitchB-GigabitEthernet1/0/1] dhcp-snooping trust[SwitchB-GigabitEthernet1/0/1] quit# Configure GigabitEthernet 1/0/2 to support Option 82.[SwitchB] interface gigabitethernet 1/0/2[SwitchB-GigabitEthernet1/0/2] dhcp-snooping information enable[SwitchB-GigabitEthernet1/0/2] dhcp-snooping information strategy replace[SwitchB-GigabitEthernet1/0/2] dhcp-snooping information circuit-id string company001[SwitchB-GigabitEthernet1/0/2] dhcp-snooping information remote-id string device001[SwitchB-GigabitEthernet1/0/2] quit# Configure GigabitEthernet 1/0/3 to support Option 82.[SwitchB] interface gigabitethernet 1/0/3[SwitchB-GigabitEthernet1/0/3] dhcp-snooping information enable[SwitchB-GigabitEthernet1/0/3] dhcp-snooping information strategy replace[SwitchB-GigabitEthernet1/0/3] dhcp-snooping information format verbose node-identifiersysname[SwitchB-GigabitEthernet1/0/3] dhcp-snooping information circuit-id format-type ascii[SwitchB-GigabitEthernet1/0/3] dhcp-snooping information remote-id format-type ascii
