Dhcp Snooping Configuration Example - HP FlexNetwork NJ5000 User Manual

Table 94 describes the fields of DHCP snooping entries.
Table 94 Field description
Item
IP Address
MAC Address
Type
Interface Name
VLAN
Remaining Lease Time

DHCP snooping configuration example

Network requirements
As shown in
GigabitEthernet 1/0/5, and to DHCP clients through GigabitEthernet 1/0/2 and GigabitEthernet 1/0/3.
•
Enable DHCP snooping on Switch B and configure DHCP snooping to support Option 82.
Configure the handling strategy for DHCP requests containing Option 82 as replace.
•
Enable GigabitEthernet 1/0/5 to forward DHCP server responses. Disable GigabitEthernet
1/0/2 and GigabitEthernet 1/0/3 from forwarding DHCP server responses.
•
Configure Switch B to record clients' IP-to-MAC address bindings in DHCP-REQUEST
messages and DHCP-ACK messages received from a trusted port.
Figure 249 Network diagram
GE1/0/2
DHCP client
Configuring Switch B
Enable DHCP snooping:
1.
a. From the navigation tree, select Network > DHCP.
b. Click the DHCP Snooping tab.
c. As shown in
snooping.
Description
Displays the IP address assigned by the DHCP server to the client.
Displays the MAC address of the client.
Displays the client type:
•
Dynamic—The IP-to-MAC binding is generated dynamically.
•
Static—The IP-to-MAC binding is configured manually. Static bindings are
not supported.
Displays the device interface to which the client is connected.
Displays the VLAN to which the device belongs.
Displays the remaining lease time of the IP address.
Figure 249, a DHCP snooping device (Switch B) is connected to a DHCP server through
Switch A
DHCP server
GE1/0/5
Switch B
DHCP snooping
GE1/0/3
Figure 250, select the Enable option next to DHCP Snooping to enable DHCP
DHCP client
241