Interactions with other features – Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) User Manual
Page 1431
DHCP Snooping Introduction and Configuration
Software Reference for x310 Series Switches
C613-50046-01 REV A
AlliedWare Plus
TM
Operating System - Version 5.4.4C
55.9
Interactions with Other Features
DHCP snooping interacts with other switch features as follows:
■
Ports in trunk mode
The DHCP snooping feature is enabled or disabled per VLAN, and several of the
related configuration settings are applied to ports. If there are multiple VLANs on a
port, all the VLANs will be subject to the same per-port settings.
■
DHCP relay
The switch cannot use DHCP snooping to filter IP traffic from a DHCP relay device.
DHCP snooping (
service dhcp-snooping command on page 56.24
) and the DHCP
relay agent option (
ip dhcp-relay agent-option command on page 64.10
) cannot
both be enabled on the switch at the same time.
■
DHCP snooping can be configured with port provisioning.
■
Authentication
DHCP snooping cannot be enabled on a switch that is configured for web
authentication (
auth-web enable command on page 43.33
), roaming authentication
auth roaming enable command on page 43.17
), or guest VLAN authentication (
), or vice versa.
■
Stacking
If DHCP snooping is enabled in a stack, the DHCP snooping database and its backup
file are automatically synchronized across all stack members, so that a new stack
master can reinstate this database.
■
Link aggregators
DHCP snooping can operate over switch ports, and over static and dynamic (LACP)
link aggregators (channel groups). If a switch port is added to an aggregator, DHCP
snooping configuration is applied to the aggregator; configuration of the original
switch port is not preserved. If the switch port is then removed from the aggregator, it
returns to default DHCP snooping settings.
■
Private VLANs
Private VLANs are not supported for DHCP snooping.