Allied Telesis AT-FS970M Series - Manual (Page 631)

AT-FS970M Switch Command Line User’s Guide
631
IP DHCP SNOOPING DELETE-BY-CLIENT
Syntax
ip dhcp snooping delete-by-client
Parameters
None
Mode
Global Configuration mode
Description
Use this command to set the switch to remove a dynamic entry from the
DHCP snooping database when it receives a valid DHCP message with
matching IP address, VLAN ID, and client hardware on an untrusted port.
In addition, setting this command causes the switch to discard release
messages that do not match an entry in the database. This command is
enabled by default.
DHCP clients send a release message when they no longer wish to use
the IP address they have been allocated by a DHCP server. Use this
command to enable DHCP snooping to use the information in these
messages to remove entries from its database immediately.
Use the no version of the command, the NO DHCP SNOOPING DELETE-
BY-CLIENT command, to ignore the release messages. Lease entries
corresponding to ignored DHCP release messages eventually time out
when the lease expires.
Confirmation Command
“SHOW RUNNING-CONFIG” on page 166
Example
This example sets the switch to delete DHCP snooping lease entries from
the DHCP snooping database when a matching release message is
received:
awplus> enable
awplus# configure terminal
awplus(config)# ip dhcp snooping delete-by-client