D-Link DES-3550 Command Line Interface Reference Manual page 181

config dhcp_relay
Purpose Used to configure the DHCP/BOOTP relay feature of the Switch.
Syntax
config dhcp_relay { hops <value 1-16> | time <sec 0-65535> }
[ add | delete ] ipif <ipif_name 12> <ipaddr>
Description This command is used to configure Switch to act as a DHCP or BOOTP relay agent,
that is, a third-party agent that transfers BOOTP and DHCP messages between
clients and servers residing on different subnets; and add or remove specified DHCP
or BOOTP servers to/from the list of recipients.
Parameters hops <value 1-16> - Specifies the maximum number of router hops allowed for DHCP
or BOOTP packets. Default is 4.
time <sec 0-65535> - This is used to make a forwarding decision. When a
DHCP/BOOTP client sends a request, information is inserted regarding the time (in
seconds) elapsed since that client began booting up. This information is read by the
Switch. The Switch forwards a DHCP request if the time elapsed is equal to or
greater than the time parameter entered here. If the elapsed time is less, the DHCP
request is dropped. The default value = 0, so the default setting requires the Switch to
forward all DHCP requests. Entering a value greater than zero here can used to
provide redundancy or backup in order to forward a DHCP request from a client that
is not normally served by the Switch.
add – This adds the DHCP or BOOTP server specified by IP interface name (ipif) and
IP address to the list used
delete – The deletes a previous addition to the DHCP relay list of eligible servers.
ipif – Specifies that a IP interface is named for the DHCP server for the relay list.
<ipif_name 12> The name of the IP interface in which DHCP relay is to be enabled.
<ipaddr> The DHCP or BOOTP server IP address.
Restrictions Only administrator-level users can issue this command.
DES-3550 Layer 2 Fast Ethernet Switch
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