C613-50057-01 REV A
Command Reference for AT-IX5-28GPX High Availability, High Power Video Surveillance PoE Switch
1301
AlliedWare Plus™ Operating System - Version 5.4.5-0.x
DHCP S
NOOPING
C
OMMANDS
IP
DHCP
SNOOPING
DELETE
-
BY
-
CLIENT
ip dhcp snooping delete-by-client
Overview
Use this command to set the switch to remove a dynamic entry from the DHCP
snooping database when it receives a valid DHCP release message with matching
IP address, VLAN ID, and client hardware address on an untrusted port, and to
discard release messages that do not match an entry in the database.
Use the
no
variant of this command to set the switch to forward DHCP release
messages received on untrusted ports without removing any entries from the
database.
Syntax
ip dhcp snooping delete-by-client
no ip dhcp snooping delete-by-client
Default
Enabled: by default, DHCP lease entries are deleted from the DHCP snooping
database when matching DHCP release messages are received.
Mode
Global Configuration
Usage
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
variant of this command to ignore these
release messages. Lease entries corresponding to ignored DHCP release messages
eventually time out when the lease expires.
Examples
To set the switch to delete DHCP snooping lease entries from the DHCP snooping
database when a matching release message is received, use the commands:
awplus#
configure terminal
awplus(config)#
ip dhcp snooping delete-by-client
To set the switch to forward and ignore the content of any DHCP release messages
it receives, use the commands:
awplus#
configure terminal
awplus(config)#
no ip dhcp snooping delete-by-client
Related
Commands
show ip dhcp snooping