DGS-1510 Series Gigabit Ethernet SmartPro Switch CLI Reference Guide
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Command Default Level
Level: 12.
Usage Guideline
The DHCP snooping function validates the DHCP packets when it arrives at the port on the VLAN that
is enabled for DHCP snooping. By default, the validation process will drop the packet if the gateway
address is not equal to 0 or Option 82 is present.
Use this command to allow packets with the relay Option 82 arriving at the untrusted interface.
Example
This example shows how to enable DHCP snooping for Option 82 to allow untrusted ports.
Switch# configure terminal
Switch(config)# ip dhcp snooping information option allow-untrusted
Switch(config)#
18-3
ip dhcp snooping database
This command is used to configure the storing of DHCP snooping binding entries to the local flash or
a remote site. Use the
no
form of this command to disable the storing or reset the parameters to the
default setting.
ip dhcp snooping database {URL | write-delay SECONDS}
no ip dhcp snooping database [write-delay]
Parameters
URL
Specifies the URL in one of the following forms:
•
tftp://location/filename
NOTE:
The flash option only includes the external memory (like
CF/SD/USB storage).
write-delay SECONDS
Specifies the time delay to write the entries after a change is seen in
the binding entry. The default is 300 seconds. The range is from 60
to 86400.
Default
By default, the URL for the database agent is not defined.
The write delay value is set to 300 seconds.
Command Mode
Global Configuration Mode.
Command Default Level
Level: 12.
Usage Guideline
Use this command to store the DHCP binding entry to local flash or remote server. Use the follow
methods to store DHCP binding entries:
tftp:
Store the entries to remote site via TFTP.
NOTE:
The flash only includes the external memory like CF/SD/USB storage.
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