Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 1455)

DHCP Snooping Commands
Software Reference for x310 Series Switches
C613-50046-01 REV A AlliedWare Plus TM Operating System - Version 5.4.4C 56.17
ip dhcp snooping delete-by-linkdown
Use this command to set the switch to remove a dynamic entry from the DHCP snooping
database when its port goes down. If the port is part of an aggregated link, the entries in
the database are only deleted if all the ports in the aggregated link are down.
Use the no variant of this command to set the switch not to delete entries when ports go
down.
Syntax ip dhcp snooping delete-by-linkdown
no ip dhcp snooping delete-by-linkdown
Default Disabled: by default DHCP Snooping bindings are not deleted when an interface goes
down.
Mode Global Configuration
Usage If this command is enabled in a stack, and the master goes down and is replaced by a new
master, entries in the DHCP snooping database for ports on the master are removed,
unless they are part of link aggregators that are still up.
Examples To set the switch to delete DHCP snooping lease entries from the DHCP snooping
database when links go down, use the commands:
To set the switch not to delete DHCP snooping lease entries from the DHCP snooping
database when links go down, use the commands:
Related Commands show ip dhcp snooping
awplus# configure terminal
awplus(config)# ip dhcp snooping delete-by-linkdown
awplus# configure terminal
awplus(config)# no ip dhcp snooping delete-by-linkdown