DES-3550 Layer 2 Fast Ethernet Switch
21
DHCP RELAY
The Switch can setup as a DHCP relay agent. A DHCP relay agent extends the reach of a DHCP server so that it is not
necessary to use multiple DHCP servers to accommodate multiple IP subnets. As a relay agent, the Switch does not manage IP
addresses. It relays DHCP requests on behalf of clients located on a local subnet to a remote or centralized DHCP server.
An additional feature has been created to further aid in local management of the IP addresses. Option 82 is used by the relay
agent to insert additional information into the client’s DHCP request. This information can be used to implement policies
intended to improve security and efficiency.
For simplicity, references to DHCP include BOOTP, i.e. DHCP requests are treated identically to BOOTP requests for the
DHCP relay agent.
The DHCP relay commands in the Command Line Interface (CLI) are listed (along with the appropriate parameters) in the
following table.
Command Parameters
config dhcp_relay {hops <value 1-16> | time <sec 0-65535>} [add | delete]
ipif <ipif_name 12> <ipaddr>
config dhcp_relay option_82 {state [enable | disable] | check [enable | disable] | policy [replace | drop |
keep] }
{ ipif <ipif_name 12> }
enable dhcp_relay
show dhcp_relay
disable dhcp_relay
Each command is listed in detail in the following sections.
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