828 CHAPTER 60: DHCP SNOOPING CONFIGURATION
Configuring DHCP
Snooping Basic
Functions
Follow these steps to configure DHCP snooping basic functions:
n
■ You need to specify the ports connected to the valid DHCP servers as trusted to
ensure that DHCP clients can obtain valid IP addresses. The trusted port and the
port connected to the DHCP client must be in the same VLAN.
■ You are not recommended to configure both the DHCP snooping and selective
Q-in-Q function on the switch, which may result in the DHCP snooping to
function abnormally.
Configuring DHCP
Snooping to Support
Option 82
Prerequisites You need to enable the DHCP Snooping function before configuring DHCP
Snooping to support Option 82.
Configuring DHCP
Snooping to Support
Option 82
Follow these steps to configure DHCP snooping to support Option 82:
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■ To support Option 82, it is required to perform related configuration on both
the DHCP server and the device enabled with DHCP Snooping. Refer to
“Configuring the Handling Mode for Option 82” on page 808 for DHCP server
configuration of this kind.
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.
To do… Use the command… Remarks
Enter system view system-view -
Enter Ethernet port view interface interface-type
interface-number
-
Enable DHCP Snooping to
support Option 82
dhcp-snooping information
enable
Required
Disabled by default.
Configure the handling
strategy for requesting
messages containing Option
82
dhcp-snooping information
strategy { drop | keep |
replace }
Optional
replace by default.
Configure the padding format
for Option 82
dhcp-snooping information
format { normal | verbose
[ node-identifier { mac |
sysname | user-defined
node-identifier }]}
Optional
normal by default.
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