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• If the DHCP snooping is globally disabled, all dynamic bindings are
removed from the binding table.
• Additional considerations when the switch itself is a DHCP client –
The port(s) through which the switch submits a client request to the
DHCP server must be configured as trusted (ip dhcp snooping
trust, page 4-273). Note that the switch will not add a dynamic entry
for itself to the binding table when it receives an ACK message from
a DHCP server. Also, when the switch sends out DHCP client packets
for itself, no filtering takes place. However, when the switch receives
any messages from a DHCP server, any packets received from
untrusted ports are dropped.
Example
This example enables DHCP snooping globally for the switch.
Related Command
ip dhcp snooping vlan (4 -272)
ip dhcp snooping trust (4 -273)
ip dhcp snooping vlan
This command enables DHCP snooping on the specified VLAN. Use the
no form to restore the default setting.
Syntax
[no] ip dhcp snooping vlan vlan-id
• vlan id - ID of a configured VLAN (Range: 1-4094)
Default Setting
Disabled
Command Mode
Global Configuration
Console(config)#ip dhcp snooping
Console(config)#
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