Dasan V8102, Руководство пользователя

Страница: 418 / 910

UMN:CLI
User Manual
V8102
418
MAC-ADDR: MAC address
120-2147483637: lease time (unit: second)
clear ip dhcp snooping binding
{ A.B.C.D | all }
Deletes a specified static DHCP snooping binding.
all: all DHCP snooping bindings
9.6.7.8 DHCP Snooping Database Agent
When DHCP snooping is enabled, the system uses the DHCP snooping binding database
to store information about untrusted interfaces. Each database entry (binding) has an IP
address, associated MAC address, lease time, interface to which the binding applies and
VLAN to which the interface belongs.
To maintain the binding when reload the system, you must use DHCP snooping database
agent. If the agent is not used, the DHCP snooping binding will be lost when the switch is
rebooted. The mechanism for the database agent saves the binding in a file at a remote
location. Upon reloading, the switch reads the file to build the database for the binding.
The system keeps the current file by writing to the file as the database changes.
To specify a DHCP database agent and enable an automatic DHCP snooping database
back-up, use the following command.
Command Mode Description
ip dhcp snooping database
A.B.C.D INTERVAL
Global
Specifies a DHCP snooping database agent and back-
up interval.
A.B.C.D: DHCP snooping database agent address
INTERVAL: 120-2147483637 (unit: second)
no ip dhcp snooping database Deletes a specified DHCP snooping database agent.
To request snooping binding entries from a DHCP snooping database agent, use the fol-
lowing command.
Command Mode Description
ip dhcp snooping database re-
new A.B.C.D
Global
Requests snooping binding entries from a DHCP
snooping database agent.
A.B.C.D: DHCP snooping database agent address
The DHCP snooping database agent should be TFTP server.
9.6.7.9 ARP Inspection Start Time
This function sets the time before ARP inspection starts to run. Before setting this, ARP
inspection should be turned on. ARP inspection checks validity of incoming ARP packets
by using DHCP snooping binding table and denies the ARP packets if they are not identi-
fied in the table.
However, the V8102 may be rebooted with any reason, then DHCP snooping binding ta-
ble entries, which are dynamically learned from DHCP packets back and forth the V8102,
would be lost. Thus, ARP inspection should be delayed to start during some time so that
DHCP snooping table can build entries. If no time given, ARP inspection sees empty
i