Dhcp Snooping Support For Option 82; Dhcp Snooping Configuration Task List - HP V1910 User Manual

2 describes roles of the ports shown in a.
Roles of ports
2.
Device
Switch A
Switch B
Switch C

DHCP snooping support for Option 82

Option 82 records the location information of the DHCP client. The administrator can locate the DHCP client
to further implement security control and accounting. For more information, see the chapter "DHCP
overview".
If DHCP snooping supports Option 82, it will handle a client's request according to the contents defined in
Option 82, if any. The handling strategies are described in the table below.
If a reply returned by the DHCP server contains Option 82, the DHCP snooping device will remove the
Option 82 before forwarding the reply to the client. If the reply contains no Option 82, the DHCP snooping
device forwards it directly.
If a client's requesting
message has...
Option 82
no Option 82

DHCP snooping configuration task list

Complete the following tasks to configure DHCP snooping:
Task
Enabling DHCP snooping
Untrusted port
GigabitEthernet 1/0/1
GigabitEthernet 1/0/3 and
GigabitEthernet 1/0/4
GigabitEthernet 1/0/1
Handling
strategy
Drop
Keep
Replace
—
Remarks
Required
By default, DHCP snooping is disabled.
Trusted port disabled from
recording binding entries
GigabitEthernet 1/0/3
GigabitEthernet 1/0/1
GigabitEthernet 1/0/3 and
GigabitEthernet 1/0/4
The DHCP snooping device will...
Drop the message.
Forward the message without changing Option 82.
Forward the message after replacing the original Option 82
with the Option 82 padded in normal format.
Forward the message after adding the Option 82 padded in
normal format.
290
Trusted port enabled to
record binding entries
GigabitEthernet 1/0/2
GigabitEthernet 1/0/2
GigabitEthernet 1/0/2