Related Documentation
Making IP-MAC Bindings in the DHCP Snooping Database Persistent (CLI Procedure)
By default, IP-MAC bindings in the DHCP snooping database do not persist. You can configure the IP-MAC bindings in the DHCP database to persist through switch reboots by configuring a storage location for the DHCP database file. When specifying the location for the DHCP database, you must also specify how frequently the switch writes the database entries into the DHCP snooping database file.
The DHCP snooping database of IP-MAC bindings is created when you enable DHCP snooping. DHCP snooping is not enabled by default. You can configure DHCP snooping on a specific VLAN or on all VLANs. See Enabling DHCP Snooping (CLI Procedure).
To make the IP-MAC bindings in the DHCP snooping database persist through switch reboots:
- For local storage, specify a local pathname as the location
in which to store the DHCP snooping database:
[edit ethernet-switching-options]
user@switch# set secure-access-port dhcp-snooping-file location local-pathname write-interval secondsFor example:
[edit ethernet-switching-options]
user@switch# set secure-access-port dhcp-snooping-file location /var/tmp/test.log write-interval 60 - For remote storage, use ftp://ip-address or ftp://hostname/path as the location in which to store the DHCP snooping database:
[edit ethernet-switching-options]
user@switch# set secure-access-port dhcp-snooping-file location remote_url write-interval secondsFor example:
[edit ethernet-switching-options]
user@switch# set secure-access-port dhcp-snooping-file location ftp://test:Test123@14.1.2.1 write-interval 60
Note: Specify any requisite user credentials for the FTP server before specifying the IP address or hostname. In this example, test is the username and Test123 is the password for FTP server 14.1.2.1.
When you are storing the DHCP snooping database at a remote location, you might also want to specify a timeout value for remote read and write operations. See timeout. This is optional.
