C
HAPTER
30
| DHCP Commands
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DEFAULT SETTING
Disabled
COMMAND USAGE
â—† DHCP also provides a mechanism for sending information about the
switch and its DHCP clients to the DHCP server. Known as DHCP Option
82, it allows compatible DHCP servers to use the information when
assigning IP addresses, or to set other services or policies for clients.
â—† Using DHCP Relay Option 82, clients can be identified by the VLAN and
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.
EXAMPLE
DHCP/Relay/Information>mode enable
DHCP/Relay/Information>
dhcp relay
information policy
This command displays or sets the DHCP relay policy for DHCP client
packets that include Option 82 information.
SYNTAX
dhcp relay information policy [replace | keep | drop]
replace - Overwrites the DHCP client packet information with the
switch's relay information.
keep - Retains the client's DHCP information.
drop - Drops the packet when it receives a DHCP message that
already contains relay information.
DEFAULT SETTING
Replace Option 82 information
EXAMPLE
DHCP/Relay/Information>policy keep
DHCP/Relay/Information>
dhcp relay statistics This command displays or clears DHCP relay statistics.
SYNTAX
dhcp relay statistics [clear]
clear - Clears DHCP relay statistics.
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