Edge-Core ES4528V-38 - Dhcp Relay Server; Dhcp Relay Information Mode

C HAPTER 30 | DHCP Commands
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COMMAND USAGE
◆ The switch supports DHCP relay service for attached host devices. If a
subnet does not include a DHCP server, you can relay DHCP client
requests to a DHCP server on another subnet.
◆ When DHCP relay is enabled and the switch sees a DHCP request
broadcast, it inserts its own IP address into the request (so that the
DHCP server knows the subnet of the client), then forwards the packet
to the DHCP server. 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
switch. The switch then broadcasts the DHCP response to the client.
◆ A DHCP relay server must first be configured (see the dhcp relay server
command on page 368) before DHCP relay mode can be enabled with
this command.
EXAMPLE
DHCP/Relay>mode enable
DHCP/Relay>
dhcp relay server This command displays or sets the IP address of the DHCP relay server.
SYNTAX
dhcp relay server [ip-address]
ip-address - IP address of DHCP server to be used by the switch's
DHCP relay agent.
DEFAULT SETTING
None
EXAMPLE
DHCP/Relay>server 192.168.1.25
DHCP/Relay>
dhcp relay
information mode
This command displays or sets the DHCP Relay Option 82 mode.
SYNTAX
dhcp relay information mode [enable | disable]
enable - Enables DHCP Relay Option 82 support. Note that DHCP
relay mode must also be enabled with the dhcp relay mode
command (see page 367) for DHCP relay information mode to take
effect.
disable - Disables DHCP Relay Option 82 support.