H3C Technologies H3C S3600 Series Switches - Manual (Page 694)

4-11
Displaying and Maintaining DHCP Snooping Configuration
To do… Use the command… Remarks
Display the user IP-to-MAC
address mapping entries
recorded by the DHCP
snooping function
display dhcp-snooping [ unit
unit-id ]
Display the (enabled/disabled)
state of the DHCP snooping
function and the trusted ports
display dhcp-snooping trust
Display the IP static binding
table
display ip source static
binding [ vlan vlan-id |
interface interface-type
interface-number ]
Available in any view
Remove DHCP snooping
entries reset dhcp-snooping
[ ip-address ]
Available in user view
DHCP Snooping Configuration Examples
DHCP-Snooping Option 82 Support Configuration Example
Network requirements
As shown in Figure 4-6 , Ethernet 1/0/5 of the switch is connected to the DHCP server, and Ethernet
1/0/1, Ethernet 1/0/2, and Ethernet 1/0/3 are respectively connected to Client A, Client B, and Client C.
z Enable DHCP snooping on the switch.
z Specify Ethernet 1/0/5 on the switch as a trusted port for DHCP snooping.
z Enable DHCP-snooping Option 82 support on the switch and set the remote ID field in Option 82 to
the system name of the switch. Set the circuit ID sub-option to abcd in DHCP packets from VLAN 1
on Ethernet 1/0/3.
Network diagram
Figure 4-6 Network diagram for DHCP-snooping Option 82 support configuration