Chapter 8
| General Security Measures
DHCPv4 Snooping
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ip dhcp snooping
information policy
This command sets the DHCP snooping information option policy for DHCP client
packets that include Option 82 information. Use the no form to restore the default
setting.
Syntax
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.
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
Console(config)#ip dhcp snooping information policy drop
Console(config)#
ip dhcp snooping
limit rate
This command sets the maximum number of DHCP packets that can be trapped by
the switch for DHCP snooping. Use the no form to restore the default setting.
Syntax
ip dhcp snooping limit rate rate
no dhcp snooping limit rate
rate - The maximum number of DHCP packets that may be trapped for
DHCP snooping. (Range: 1-2048 packets/second)
Default Setting
Disabled
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