Installation manual

4-168
SIGNAMAX LLC • www.signamax.eu
ip dhcp snooping information policy
This command sets the DHCP snooping information option policy for DHCP client
packets that include Option 82 information.
Syntax
ip dhcp snooping information policy {drop | keep | replace}
• 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 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
ip dhcp snooping database flash
This command writes all dynamically learned snooping entries to flash memory.
Command Mode
Privileged Exec
Command Usage
This command can be used to store the currently learned dynamic DHCP snooping
entries to flash memory. These entries will be restored to the snooping table when
the switch is reset. However, note that the lease time shown for a dynamic entry
that has been restored from flash memory will no longer be valid.
Example
Console(config)#ip dhcp snooping information policy drop
Console(config)#
Console(config)#ip dhcp snooping database flash
Console(config)#