H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – DHCP
H3C S7500E Series Ethernet Switches Chapter 5 DHCP Snooping Configuration
5-4
If a client’s
requesting
message has…
Handling
strategy
Padding
format
The DHCP snooping device will…
Drop Random Drop the message.
Keep Random
Forward the message without
changing Option 82.
normal
Forward the message after replacing
the original Option 82 with the Option
82 padded in normal format.
Option 82
Replace
verbose
Forward the message after replacing
the original Option 82 with the Option
82 padded in verbose format.
—
normal
Forward the message after adding the
Option 82 padded in normal format.
no Option 82
—
verbose
Forward the message after adding the
Option 82 padded in verbose format.
 Note:
The handling strategy and padding format for Option 82 on the DHCP-Snooping device
are the same as those on the relay agent.
5.2 Configuring DHCP Snooping Basic Functions
Follow these steps to configure DHCP snooping basic functions:
To do… Use the command… Remarks
Enter system view
system-view
—
Enable DHCP snooping
dhcp-snooping
Required
Disabled by default.
Enter Ethernet port view
interface interface-type
interface-number
—
Specify the port as trusted
dhcp-snooping trust
[ no-user-binding ]
Required
Untrusted by default.