H3C Technologies H3C S5560 Series Switches - Manual (Page 92)

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Task Command Remarks
Display information about the file that
stores DHCP snooping entries.
display dhcp snooping binding database
Available in any
view.
Clear DHCP snooping entries.
reset dhcp snooping binding { all | ip
ip-address [ vlan vlan-id ] } Available in user
view.
Clear DHCP packet statistics on the
DHCP snooping device. reset dhcp snooping packet statistics [ slot
slot-number ] Available in user
view.
DHCP snooping configuration examples
Basic DHCP snooping configuration example
Network requirements
As shown in Figure 28 :
• Configure the port GigabitEthernet1/0/1 connected to the DHCP server as a trusted port.
• Configure other ports as untrusted ports.
• Enable DHCP snooping to record clients' IP-MAC bindings by reading DHCP-ACK messages
received from the trusted port and DHCP-REQUEST messages.
Figure 28 Network diagram
Configuration procedure
# Enable DHCP snooping.
system-view
[SwitchB] dhcp snooping enable
# Configure GigabitEthernet 1/0/1 as a trusted port.
[SwitchB] interface GigabitEthernet 1/0/1
[SwitchB-GigabitEthernet1/0/1] dhcp snooping trust
[SwitchB-GigabitEthernet1/0/1] quit
# Enable DHCP snooping to record clients' IP-MAC bindings on GigabitEthernet 1/0/2.
[SwitchB] interface GigabitEthernet 1/0/2
[SwitchB-GigabitEthernet1/0/2] dhcp snooping binding record