Dhcp Snooping Commands; Ip Dhcp Snooping; Table 4-85 Dhcp Snooping Commands - Edge-Core ES3510 Management Manual

DHCP Snooping Commands

DHCP snooping allows a switch to protect a network from rogue DHCP servers or
other devices which send port-related information to a DHCP server. This
information can be useful in tracking an IP address back to a physical port. This
section describes commands used to configure DHCP snooping.
Command

ip dhcp snooping

ip dhcp snooping vlan
ip dhcp snooping trust
ip dhcp snooping verify
mac-address
ip dhcp snooping
information option
ip dhcp snooping
information policy
ip dhcp snooping
database flash
show ip dhcp snooping
show ip dhcp snooping
binding
ip dhcp snooping
This command enables DHCP snooping globally. Use the no form to restore the
default setting.
Syntax
[no] ip dhcp snooping
Default Setting
Disabled
Command Mode
Global Configuration
Command Usage
• Network traffic may be disrupted when malicious DHCP messages are
received from an outside source. DHCP snooping is used to filter DHCP
messages received on an unsecure interface from outside the network or
firewall. When DHCP snooping is enabled globally by this command, and
enabled on a VLAN interface by the ip dhcp snooping vlan command
(page 4-303), DHCP messages received on an untrusted interface (as
specified by the no ip dhcp snooping trust command, page 4-304) from a
device not listed in the DHCP snooping table will be dropped.

Table 4-85 DHCP Snooping Commands

Function
Enables DHCP snooping globally
Enables DHCP snooping on the specified VLAN
Configures the specified interface as trusted
Verifies the client's hardware address stored in the DHCP
packet against the source MAC address in the Ethernet header
Enables or disables DHCP Option 82 information relay
Sets the information option policy for DHCP client packets that
include Option 82 information
Writes all dynamically learned snooping entries to flash
memory
Shows the DHCP snooping configuration settings
Shows the DHCP snooping binding table entries
DHCP Snooping Commands
Mode
GC
GC
IC
GC
GC
GC
GC
PE
PE
4
Page
4-301
4-303
4-304
4-305
4-305
4-306
4-307
4-307
4-308
4-301