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DHCP Snooping Commands
4-231
4
Default Setting
All interfaces are untrusted
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• An untrusted interface is an interface that is configured to receive messages
from outside the network or firewall. A trusted interface is an interface that is
configured to receive only messages from within the network.
• When DHCP snooping enabled globally using the
ip dhcp snooping
command (page
4-228
), and enabled on a VLAN with this command, 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 (4-228)
ip dhcp snooping vlan (4-230)
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)#
Summary of Contents for 8124PL2
Page 1: ...MANAGEMENT GUIDE TigerSwitchTM 10 100 1000 24 Port Managed Switch with PoE SMC8124PL2 ...
Page 2: ......
Page 20: ...xvi Contents ...
Page 27: ...xxiii Figures ...
Page 35: ...Introduction 1 8 1 ...
Page 45: ...Initial Configuration 2 10 2 ...
Page 148: ...Port Configuration 3 103 Figure 3 61 Displaying Etherlike and RMON Statistics ...
Page 473: ...Command Line Interface 4 240 4 ...
Page 477: ...Software Specifications A 4 A ...
Page 489: ...Index Index 4 menu list 3 3 panel display 3 3 ...
Page 490: ......