Displaying And Maintaining Dhcp Snooping; Dhcp Snooping Configuration Examples; Dhcp Snooping Configuration Example - HP A5120 EI Series Configuration Manual

To do...
Configure the maximum
rate of incoming DHCP
packets
NOTE:

You can configure DHCP packet rate limit only on Layer 2 Ethernet interfaces and Layer 2 aggregate interfaces.

If a Layer 2 Ethernet interface belongs to an aggregation group, it uses the DHCP packet maximum rate
configured on the corresponding Layer 2 aggregate interface.

Displaying and maintaining DHCP snooping

To do...
Display DHCP snooping entries
Display Option 82 configuration
information on the DHCP snooping
switch
Display DHCP packet statistics on the
DHCP snooping switch
Display information about trusted ports
Display the DHCP snooping entry file
information
Clear DHCP snooping entries
Clear DHCP packet statistics on the
DHCP snooping switch

DHCP snooping configuration examples

DHCP snooping configuration example

Network requirements
As shown in
two DHCP clients through GigabitEthernet 1/0/2 and GigabitEthernet 1/0/3. GigabitEthernet 1/0/1
forwards DHCP server responses while the other two do not.
Switch B records clients' IP-to-MAC address bindings in DHCP-REQUEST messages and DHCP-ACK
messages received from trusted ports.
Use the command...
dhcp-snooping rate-limit rate
Figure 32, Switch B is connected to a DHCP server through GigabitEthernet 1/0/1, and to
Remarks
Required
Not configured by default.
Use the command...
display dhcp-snooping [ ip ip-address ] [
| { begin | exclude | include } regular-
expression ]
display dhcp-snooping information { all
| interface interface-type interface-
number } [ | { begin | exclude | include
} regular-expression ]
display dhcp-snooping packet statistics [
slot slot-number ] [ | { begin | exclude |
include } regular-expression ]
display dhcp-snooping trust [ | { begin |
exclude | include } regular-expression ]
display dhcp-snooping binding database
[ | { begin | exclude | include } regular-
expression ]
reset dhcp-snooping { all | ip ip-address
}
reset dhcp-snooping packet statistics [
slot slot-number ]
73
Remarks
Available in any view
Available in any view
Available in any view
Available in any view
Available in any view
Available in user
view
Available in user
view