Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 1432)

DHCP Snooping Introduction and Configuration
Software Reference for x310 Series Switches
55.10 AlliedWare Plus TM Operating System - Version 5.4.4C C613-50046-01 REV A
Configuration
This section provides a general configuration procedure for DHCP snooping.
Configure DHCP Snooping
Note that if a port in trunk mode has multiple VLANs attached, then the DHCP snooping
configuration settings for the port apply to all the VLANs.
Table 55-2: General configuration procedure for DHCP snooping
Enable DHCP snooping
1.
awplus#
configure terminal Enter Global Configuration mode.
2.
awplus(config)#
service dhcp-snooping Enable DHCP snooping on the switch.
Default: disabled
3.
awplus(config)#
interface <vid-list> Enter Interface Configuration mode for the
VLANs to enable DHCP snooping on.
4.
awplus(config-if)#
ip dhcp snooping Enable DHCP snooping on these VLANs.
Default: disabled
5.
awplus(config-if)#
exit Return to Global Configuration mode.
6.
awplus(config-if)#
interface <port-list> Enter Interface Configuration mode for ports
connected to the trusted network. The port(s)
connected to the DHCP server(s) must be
configured as trusted ports.
7.
awplus(config-if)#
ip dhcp snooping trust Set these ports to be trusted ports.
Default: untrusted
8.
awplus(config-if)#
exit Return to Global Configuration mode.
9.
awplus(config)#
interface <port-list> If you want to allow more than one DHCP lease
for any ports, enter Interface Configuration
mode for the required ports. The default is likely
to be suitable for edge ports; on an aggregation
switch, you may need to increase the maximum
number of leases for ports connected to other
switches and/or for multiple VLANs. Note that
you cannot change this setting once DHCP
snooping ACLs are attached to these interfaces.