ECS4110-28T_Management Guide

C HAPTER 17 | IP Services
Dynamic Host Configuration Protocol
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WEB INTERFACE
To configure a DHCP client identifier:
1. Click IP Service, DHCP, Client.
2. Mark the check box to enable this feature. Select the default setting, or
the format for a vendor class identifier. If a non-default value is used,
enter a text string or hexadecimal value.
3. Click Apply.
Figure 402: Specifying a DHCP Client Identifier
CONFIGURING DHCP
RELAY SERVICE
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 passes the DHCP response received from the server to the client.
Figure 403: Layer 2 DHCP Relay Service
CLI REFERENCES
◆ "DHCP Relay" on page 1417
COMMAND USAGE
◆ You must specify the IP address for at least one active DHCP server.
Otherwise, the switch’s DHCP relay agent will not be able to forward
client requests to a DHCP server. Up to five DHCP servers can be
specified in order of preference.
◆ DHCP relay configuration will be disabled if an active DHCP server is
detected on the same network segment.
Provides IP address
compatible with switch
segment to which client
is attached
DHCP
Server