Digisol DG-GS4826S, Management Manual

Page: 525 / 1344

C
HAPTER
20 | IP Services
Dynamic Host Configuration Protocol
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C
ONFIGURING
DHCP
R
ELAY
S
ERVICE
Use the IP Service > DHCP > Relay page to configure DHCP relay service
for attached host devices. If DHCP relay is enabled, and this switch sees a
DHCP request broadcast, 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 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 DHCP relay agent (i.e., this switch). This switch
then broadcasts the DHCP response received from the server to the client.
Figure 319: Layer 3 DHCP Relay Service
CLI R
EFERENCES
u
"ip dhcp relay server" on page 1092
u
"ip dhcp restart relay" on page 1093
C
OMMAND
U
SAGE
u
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.
u
DHCP relay configuration will be disabled if an active DHCP server is
detected on the same network segment.
P
ARAMETERS
These parameters are displayed in the web interface:
u
VLAN ID – ID of configured VLAN.
u
Server IP Address – Addresses of DHCP servers to be used by the
switch’s DHCP relay agent in order of preference.
u
Restart DHCP Relay – Use this button to re-initialize DHCP relay
service.
W
EB
I
NTERFACE
To configure DHCP relay service:
1. Click IP Service, DHCP, Relay.
2.
Enter up to five IP addresses for any VLAN.
3. Click Apply.
Provides IP address
compatible with switch
segment to which client
is attached
DHCP
Server