4-8
[SwitchB-GigabitEthernet1/0/1] dhcp-snooping trust
[SwitchB-GigabitEthernet1/0/1] quit
DHCP Snooping Option 82 Support Configuration Example
Network requirements
z 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 as
company001 and for the remote ID sub-option as device001.
z On GigabitEthernet 1/0/3, configure the padding format as verbose, access node identifier as
sysname, 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, so
that the DHCP clients can obtain IP addresses.
Configuration procedure
# Enable DHCP snooping.
<SwitchB> 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-identifier
sysname
[SwitchB-GigabitEthernet1/0/3] dhcp-snooping information circuit-id format-type ascii
[SwitchB-GigabitEthernet1/0/3] dhcp-snooping information remote-id format-type ascii
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