SMC Networks TigerAccess SMC7816M - Manual (Page 921)

DHCP R
ELAY
37-3
ip dhcp relay server
This command enables DHCP relay service, and specifies the address of
the server to use. Use the no form to clear a server address.
Syntax
ip dhcp relay server address
no ip dhcp relay server
address - IP address of a DHCP server.
Default Setting
None
Command Mode
Global Configuration
Usage Guidelines
• DHCP relay service only applies to the management VLAN. DHCP
client request packets entering any other VLAN on the switch will be
flooded.
• This command is used to configure DHCP relay for host devices
attached to the switch. If DHCP relay service is enabled (by specifying
the address for at least one DHCP server), and this switch sees a
DHCP request broadcast, it inserts its own IP address into the request
so the DHCP server will know the subnet where the client is located.
Then, the switch forwards the packet to the DHCP server on another
network. When the server receives the DHCP request, it allocates a
free IP address for the DHCP client from its defined scope for the
DHCP client’s subnet, and sends a DHCP response back to the
DHCP relay agent (i.e., this switch). This switch then broadcasts the
DHCP response received from the server to the client.
• You must specify the IP address for at least one DHCP server.
Otherwise, the switch’s DHCP relay agent will not forward client
requests to a DHCP server. Up to five DHCP servers can be specified.
• To terminate DHCP relay service, all configured server addresses must
be cleared with the no form of this command.