Displaying And Maintaining Dhcp Snooping; Dhcp Snooping Configuration Example - H3C S7500 Series Operation Manual

Operation Manual – DHCP
H3C S7500 Series Ethernet Switches
II. Enabling DHCP-Snooping option 82
Follow these steps to enable DHCP-snooping option 82 on a DHCP-snooping-enabled
network device:
Enter system view
Enable DHCP-Snooping
option 82

4.3 Displaying and Maintaining DHCP Snooping

Display the IP-MAC mappings
recorded by the
DHCP-Snooping-enabled switch
Display DHCP-Snooping status
and trusted port information
Display the total number of
DHCP-Snooping binding table
entries
Display the DHCP-Snooping
binding table entries of the
specified VLAN
Clear the IP-MAC mappings
recorded by the
DHCP-Snooping-enabled switch

4.4 DHCP Snooping Configuration Example

I. Network requirements
As shown in
(acting as a DHCP relay agent). A network segment containing some DHCP clients is
connect to the Ethernet 2/0/2 port of Switch A.
The DHCP snooping function is enabled on Switch A.
The DHCP-Snooping-enabled device supports option 82 and option 82 is enabled
on the switch.
The Ethernet 2/0/1 port of Switch A is a trusted port.
To do...
system-view
dhcp-snooping
information enable
To do...
Figure 4-3, the Ethernet 2/0/1 port of Switch A is connected to Switch B
Chapter 4 DHCP Snooping Configuration
Use the command...
Use the command...
display dhcp-snooping
display dhcp-snooping trust
display dhcp-snooping count
display dhcp-snooping vlan
{ vlan-list | all }
reset dhcp-snooping
[ ip-address ]
4-5
Remarks
—
Required
This function is disabled
by default
Remarks
Available in
any view
Available in
user view