New Feature Manual - DHCP
Quidway S3900 Series Ethernet Switches-Release 1510
Chapter 3 DHCP Snooping Configuratio
n Commands
Huawei Technologies Proprietary
3-2
View
Ethernet port view
Parameter
None
Description
Use the dhcp-snooping trust command to set an Ethernet port to a trusted port.
Use the undo dhcp-snooping trust command to restore an Ethernet port to an
untrusted port.
DHCP snooping security allow you to set a port to a trusted port or an untrusted port,
so that DHCP clients can obtain IP addresses from only valid DHCP servers.
z Trusted ports can be used to connect DHCP servers or ports of other switches.
Untrusted ports can be used to connect DHCP clients or networks.
z Trusted ports forward any received DHCP packets to ensure that DHCP clients
can obtain IP addresses from valid DHCP servers. Untrusted ports discard the
DHCP-ACK and DHCP-OFF responses received from DHCP servers.
z By default, all the ports of a switch are untrusted ports.
Related command: display dhcp-snooping trust.
Example
# Enter system view.
<Quidway> system-view
System View: return to User View with Ctrl+Z.
# Set the Ethernet1/0/1 port to a trusted port.
[Quidway] interface Ethernet 1/0/1
[Quidway-Ethernet1/0/1] dhcp-snooping trust
3.1.3 display dhcp-snooping
Syntax
display dhcp-snooping [ unit unit-id ]
View
Any view
Parameter
unit unit-id: Displays the DHCP-snooping information on other devices in fabric when
the switch is in fabric. unit-id indicates the number of the device whose
DHCP-snooping information needs to be viewed.
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