Edge-Core ECS4110-28T Management Manual page 1418

| DHCP Commands
C 45
HAPTER
DHCP Relay
ip dhcp restart relay
C M
OMMAND ODE
Interface Configuration (VLAN)
U G
SAGE UIDELINES
DHCP relay service applies to DHCP client requests received on the
◆
specified VLAN.
This command is used to configure DHCP relay for host devices
◆
attached to the switch. If DHCP relay service is enabled, and this switch
sees a DHCP client request, it inserts its own IP address into the
request so that the DHCP server will know the subnet where the client
is located. Then, the switch forwards the packet to a 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 passes 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 in
order of preference.
If any of the specified DHCP server addresses are not located in the
same network segment with this switch, use the
ipv6 default-gateway
which this switch can reach other IP subnetworks.
◆ To start DHCP relay service, enter the
E
XAMPLE
Console(config)#interface vlan 1
Console(config-if)#ip dhcp relay server 10.1.0.99
Console(config-if)#
R C
ELATED OMMANDS
ip dhcp restart relay (1418)
This command enables DHCP relay for the specified VLAN. Use the no form
to disable it.
D S
EFAULT ETTING
Disabled
C M
OMMAND ODE
Privileged Exec
C U
OMMAND SAGE
This command is used to configure DHCP relay functions for host devices
attached to the switch. If DHCP relay service is enabled, and this switch
sees a DHCP request broadcast, it inserts its own IP address into the
– 1418 –
command to specify the default router through
ip dhcp restart relay
ip default-gateway or
command.