Dhcp Snooping Configuration Task List; Configuring Basic Dhcp Snooping - HP 6125XLG Configuration Manual

Table 4 Handling strategies
If a DHCP request
has...
Option 82
No Option 82

DHCP snooping configuration task list

If you configure DHCP snooping settings on an Ethernet interface that has been added to an
aggregation group, the settings do not take effect unless the interface is removed from the aggregation
group.
Tasks at a glance
(Required.)
(Optional.)
(Optional.)
(Optional.)
(Optional.)
(Optional.)

Configuring basic DHCP snooping

Follow these guidelines when you configure basic DHCP snooping:
Specify the ports connected to authorized DHCP servers as trusted ports to make sure that DHCP
•
clients can obtain valid IP addresses. The trusted ports and the ports connected to DHCP clients
must be in the same VLAN.
Ethernet interfaces and aggregate interfaces can be specified as trusted ports. For more information
•
about aggregate interfaces, see Layer 2—LAN Switching Configuration Guide.
If you configure DHCP snooping settings on an Ethernet interface that has been added to an
•
aggregation group, the settings do not take effect unless the interface is removed from the
aggregation group.
• DHCP snooping can work with QinQ to record VLAN tags for DHCP packets received from clients.
Upon receiving a DHCP packet that has one VLAN tag, QinQ adds an outer tag to the packet.
DHCP snooping records the two VLAN tags of the packet in a DHCP snooping entry. For more
information about QinQ, see Layer 2—LAN Switching Configuration Guide.
To configure basic DHCP snooping:
Handling
strategy
Drop
Keep
Replace
N/A
Configuring basic DHCP snooping
Configuring Option 82
Saving DHCP snooping entries
Enabling DHCP starvation attack protection
Enabling DHCP-REQUEST attack protection
Configuring DHCP packet rate limit
DHCP snooping...
Drops the message.
Forwards the message without changing Option 82.
Forwards the message after replacing the original Option 82 with
the Option 82 padded according to the configured padding format,
padding content, and code type.
Forwards the message after adding the Option 82 padded
according to the configured padding format, padding content, and
code type.
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