H3C S5500-SI Series, Operation Manual

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4-4
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.
verbose
Forward the message after replacing the
original Option 82 with the Option 82
padded in verbose format.
Option 82
Replace
user-defined
Forward the message after replacing the
original Option 82 with the user-defined
Option 82.
— normal
Forward the message after adding the
Option 82 padded in normal format.
— verbose
Forward the message after adding the
Option 82 padded in verbose format.
no Option 82
— user-defined
Forward the message after adding the
user-defined Option 82.
The handling strategy and padding format for Option 82 on the DHCP snooping device are the same as
those on the relay agent.
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 interface view
interface interface-type
interface-number
—
Specify the port as trusted
dhcp-snooping trust
[ no-user-binding ]
Required
Untrusted by default.