95
Figure 32 Network diagram
Procedure
# Assign GigabitEthernet 1/0/1, GigabitEthernet 1/0/2, and GigabitEthernet 1/0/3 to VLAN 100.
<SwitchB> system-view
[SwitchB] vlan 100
[SwitchB-vlan100] port gigabitethernet 1/0/1 to gigabitethernet 1/0/3
[SwitchB-vlan100] quit
# Enable DHCP snooping for VLAN 100.
[SwitchB] dhcp snooping enable vlan 100
# Configure GigabitEthernet 1/0/1 as DHCP snooping trusted port.
[SwitchB] vlan 100
[SwitchB-vlan100] dhcp snooping trust gigabitethernet 1/0/1
# Enable recording clients' IP-to-MAC bindings in VLAN 100.
[SwitchB-vlan100] dhcp snooping binding record
[SwitchB-vlan100] quit
Verifying the configuration
# Verify that the DHCP client can obtain an IP address and other configuration parameters only from
the authorized DHCP server. (Details not shown.)
# Display the DHCP snooping entry recorded for the client.
[SwitchB] display dhcp snooping binding
Example: Configuring DHCP snooping support for Option 82
Network configuration
As shown in Figure 33, enable DHCP snooping and configure Option 82 on Switch B as follows:
• Configure the handling strategy for DHCP requests that contain Option 82 as
replace.
• 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.
• On GigabitEthernet 1/0/3, configure the padding mode for the Circuit ID sub-option as
verbose, access node identifier as sysname, and padding format as ascii. Configure the
padding content for the Remote ID sub-option as
device001.
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