Web Management Guide

Table Of Contents
Chapter 18
| IP Services
Dynamic Host Configuration Protocol
– 623 –
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 413: Specifying a DHCP Client Identifier
Configuring DHCP L3
Relay Service
If the switch is configured to provide L3 DHCP Relay service use the IP Service >
DHCP > Relay page to configure L3 DHCP relay service for attached host devices. To
configure L2 or L3 DHCP relay service refer to the CLI Reference Guide DHCP Relay
settings of the CLI Reference Guide - specifically the command: ip dhcp l2/l3 relay.
If L3 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 clients 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 414: Layer 3 DHCP Relay Service
Command Usage
You must specify the IP address for at least one active DHCP server. Otherwise,
the switchs 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.
Provides IP address
compatible with switch
segment to which client
is attached
DHCP
Server