SMC Networks SMC Tiger 10/100 SMC6128L2 - Manual (Page 288)

C
ONFIGURING THE
S
WITCH
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When the DHCP Snooping Information Option is enabled, clients can be
identified by the switch port to which they are connected rather than just
their MAC address. DHCP client-server exchange messages are then
forwarded directly between the server and client without having to flood
them to the entire VLAN.
In some cases, the switch may receive DHCP packets from a client that
already includes DHCP Option 82 information. The switch can be
configured to set the action policy for these packets. Either the switch can
discard the Option 82 information, keep the existing information, or
replace it with the switch’s relay information.
Note: DHCP snooping must be enabled on the switch for the DHCP
Option 82 information to be inserted into packets.
Command Attributes
• DHCP Snooping Information Option Status – Enables or disables
DHCP Option 82 information relay.
• DHCP Snooping Information Option Policy – Sets the DHCP
snooping information option policy for DHCP client packets that
include Option 82 information.
- Replace – Overwrites the DHCP client packet information with the
switch’s relay information.
- Keep – Retains the client’s DHCP information.
- Drop – Discards the Option 82 information in a packet and then
floods it to the entire VLAN.