HP FlexNetwork NJ5000, Руководство пользователя

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Table 94 describes the fields of DHCP snooping entries.
Table 94 Field description
Item Description
IP Address Displays the IP address assigned by the DHCP server to the client.
MAC Address Displays the MAC address of the client.
Type
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.
Interface Name Displays the device interface to which the client is connected.
VLAN Displays the VLAN to which the device belongs.
Remaining Lease Time Displays the remaining lease time of the IP address.
DHCP snooping configuration example
Network requirements
As shown in Figure 249 , a DHCP snooping device (Switch B) is connected to a DHCP server through
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
Configuring Switch B
1.
Enable DHCP snooping:
a.
From the navigation tree, select
Network
>
DHCP
.
b.
Click the
DHCP Snooping
tab.
c.
As shown in Figure 250 , select the
Enable
option next to
DHCP Snooping
to enable DHCP
snooping.
Switch A
DHCP server
Switch B
DHCP snooping
GE1/0/5
DHCP client DHCP client
GE1/0/2
GE1/0/3