Chapter 9 Network Application; Dhcp; Dhcp Relay - D-Link DGS-3120-24TC Product Manual

xStack® DGS-3120 Series Managed Switch Web UI Reference Guide
Chapter 9

DHCP

SNTP
Flash File System Settings
DHCP

DHCP Relay

DHCP Relay Global Settings
Users can enable and configure DHCP Relay Global Settings. The relay hops count limit allows the maximum
number of hops (routers) that the DHCP messages can be relayed through to be set. If a packet's hop count is
more than the hop count limit, the packet is dropped. The range is between 1 and 16 hops, with a default value of 4.
The relay time threshold sets the minimum time (in seconds) that the Switch will wait before forwarding a
BOOTREQUEST packet. If the value in the seconds' field of the packet is less than the relay time threshold, the
packet will be dropped. The range is between 0 and 65,535 seconds, with a default value of 0 seconds.
To view this window, click Network Application > DHCP > DHCP Relay > DHCP Relay Global Settings as
shown below:
The fields that can be configured are described below:
Parameter
DHCP Relay State
DHCP Relay Hops
Count Limit (1-16)
DHCP Relay Time
Threshold (0-65535)
DHCP Relay Option 82
Network Application
Figure 9–1 DHCP Relay Global Settings window
Description
This field can be toggled between Enabled and Disabled using the pull-down menu.
It is used to enable or disable the DHCP Relay service on the Switch. The default is
Disabled.
This field allows an entry between 1 and 16 to define the maximum number of
router hops DHCP messages can be forwarded. The default hop count is 4.
Allows an entry between 0 and 65535 seconds, and defines the maximum time limit
for routing a DHCP packet. If a value of 0 is entered, the Switch will not process the
value in the seconds' field of the DHCP packet. If a non-zero value is entered, the
Switch will use that value, along with the hop count to determine whether to forward
a given DHCP packet.
This field can be toggled between Enabled and Disabled using the pull-down menu.
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