Configuring Switching Information 437
•
Store Locally
— Choose whether to store the DHCP snooping database locally in flash or on a remote
system:
–
Local
— Select the Local check box to store the
DHCP binding database in the flash memory on
the switch
.
–
Remote
— Check the Remote check box to store the
DHCP binding database on a remote
server
.
•
Remote IP Address
— Enter the Remote IP address on which the snooping database will be stored
when the Remote check box is selected.
•
Remote File Name
— Enter the Remote filename to store the database when the Remote check box is
selected.
•
Write Delay
— Enter the maximum write time to write the database into the local or remote location.
The write delay range is 15 to 86400 seconds.
Configuring the DHCP Snooping Persistent Database With CLI Commands
For information about the CLI commands that perform this function, refer to the following chapter in
the
CLI Reference Guide
:
• DHCP Snooping Commands
The following table summarizes the equivalent CLI commands for this feature.
DHCP Snooping Static Bindings Configuration
Use the DHCP Snooping Static Bindings Configuration page to add static DHCP bindings to the
binding database.
The DHCP snooping application uses DHCP messages to build and maintain the binding’s database.
The binding’s database only includes data for clients on untrusted ports. DHCP snooping creates a
tentative binding from DHCP DISCOVER and REQUEST messages. Tentative bindings tie a client to a
port (the port where the DHCP client message was received). Tentative bindings are completed when
DHCP snooping learns the client’s IP address from a DHCP ACK message on a trusted port. DHCP
snooping removes bindings in response to DECLINE, RELEASE, and NACK messages. The DHCP
snooping application ignores the ACK messages as a reply to the DHCP Inform messages received on
trusted ports. You can also enter static bindings into the binding database.
Table 7-68. DHCP Snooping Persistent Database Commands
CLI Command Description
ip dhcp snooping database Configures the persistent location of the DHCP snooping database.
ip dhcp snooping database write-delay Configures the interval in seconds at which the DHCP Snooping
database will be stored in persistent storage.
show ip dhcp snooping database Displays the DHCP snooping configuration related to the database
persistence.
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