Configuring Dhcp Snooping Basic Functions; Configuring Dhcp Snooping To Support Option - 3Com Switch 4800G 24-Port Configuration Manual

828 C 60: DHCP S
HAPTER
Configuring DHCP
Snooping Basic
Functions
Configuring DHCP
Snooping to Support
Option 82
Prerequisites
Configuring DHCP
Snooping to Support
Option 82
C
NOOPING ONFIGURATION
Follow these steps to configure DHCP snooping basic functions:
To do...
Enter system view
Enable DHCP snooping
Enter Ethernet port view
Specify the port as trusted
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.
You need to enable the DHCP Snooping function before configuring DHCP
Snooping to support Option 82.
Follow these steps to configure DHCP snooping to support Option 82:
To do...
Enter system view
Enter Ethernet port view
Enable DHCP Snooping to
support Option 82
Configure the handling
strategy for requesting
messages containing Option
82
Configure the padding format
for Option 82
n
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.
Use the command...
system-view
dhcp-snooping
interface interface-type
interface-number
dhcp-snooping trust
[ no-user-binding ]
Use the command...
system-view
interface interface-type
interface-number
dhcp-snooping information
enable
dhcp-snooping information
strategy { drop | keep |
replace }
dhcp-snooping information
format { normal | verbose
[ node-identifier { mac |
sysname | user-defined
node-identifier } ] }
Remarks
-
Required
Disabled by default.
-
Required
Untrusted by default.
Remarks
-
-
Required
Disabled by default.
Optional
replace by default.
Optional
normal by default.