Command Line Interface
4-168
4
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• A trusted interface is an interface that is configured to receive only messages
from within the network. An untrusted interface is an interface that is
configured to receive messages from outside the network or firewall.
• Set all ports connected to DHCP servers within the local network or firewall to
trusted, and all other ports outside the local network or firewall to untrusted.
• When DHCP snooping ia enabled globally using the
command (page 4-165), and enabled on a VLAN with
command (page 4-167), DHCP packet filtering will be performed on any
untrusted ports within the VLAN according to the default status, or as
specifically configured for an interface with the
no ip dhcp snooping trust
command.
• When an untrusted port is changed to a trusted port, all the dynamic DHCP
snooping bindings associated with this port are removed.
•
Additional considerations when the switch itself is a DHCP client
– The port(s)
through which it submits a client request to the DHCP server must be
configured as trusted.
Example
This example sets port 5 to untrusted.
Related Commands
ip dhcp snooping (4-165)
ip dhcp snooping vlan (4-167)
ip dhcp snooping verify mac-address
This command verifies the client’s hardware address stored in the DHCP packet
against the source MAC address in the Ethernet header. Use the
no
form to disable
this function.
Syntax
[
no
]
ip dhcp snooping verify mac-address
Default Setting
Enabled
Command Mode
Global Configuration
Console(config)#interface ethernet 1/5
Console(config-if)#no ip dhcp snooping trust
Console(config-if)#
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