Configuring Dhcp Snooping Basic Functions - H3C S5500-EI series Operation Manual

Operation Manual – DHCP
H3C S5500-EI Series Ethernet Switches
If a client's
requesting
message has...
Option 82
no Option 82
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:
Enter system view
Enable DHCP snooping
Enter Ethernet port view
Specify the port as trusted
Handling
strategy
Drop
Keep
Replace
—
—
To do...
system-view
dhcp-snooping
interface interface-type
interface-number
dhcp-snooping trust
[ no-user-binding ]
Chapter 5 DHCP Snooping Configuration
Padding
The DHCP snooping device will...
format
Random Drop the message.
Forward the message without
Random
changing Option 82.
Forward the message after replacing
normal the original Option 82 with the Option
82 padded in normal format.
Forward the message after replacing
verbose the original Option 82 with the Option
82 padded in verbose format.
Forward the message after adding the
normal
Option 82 padded in normal format.
Forward the message after adding the
verbose
Option 82 padded in verbose format.
Use the command...
5-4
Remarks
—
Required
Disabled by default.
—
Required
Untrusted by default.