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Example
This example enables the DHCP Snooping Information Option.
ip dhcp snooping
This command sets the DHCP snooping information option policy for DHCP client
information policy
packets that include Option 82 information. Use the no form to restore the default
setting.
Syntax
Default Setting
replace
Command Mode
Global Configuration
Command Usage
When the switch receives DHCP packets from clients that already include DHCP
Option 82 information, the switch can be configured to set the action policy for
these packets. The switch can either drop the DHCP packets, keep the existing
information, or replace it with the switch's relay information.
Example
Use the ip dhcp snooping information option command to specify how to
handle DHCP client request packets which already contain Option 82
information.
Console(config)#ip dhcp snooping information option
Console(config)#
ip dhcp snooping information policy {drop | keep | replace}
no ip dhcp snooping information policy
drop - Drops the client's request packet instead of relaying it.
keep - Retains the Option 82 information in the client request, and
forwards the packets to trusted ports.
replace - Replaces the Option 82 information circuit-id and remote-id fields
in the client's request with information about the relay agent itself, inserts
the relay agent's address (when DHCP snooping is enabled), and forwards
the packets to trusted ports.
Console(config)#ip dhcp snooping information policy drop
Console(config)#
– 245 –
Chapter 8
| General Security Measures
DHCP Snooping
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