xStack® DES-3528/DES-3552 Series Layer 2 Managed Stackable Fast Ethernet Switch Web UI Reference Guide
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Chapter 9 - Network Application
DHCP
DNS
PPPoE Circuit ID Insertion Settings
SNTP
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:
Figure 9-1 DHCP Relay Global Settings window
The fields that can be configured are described below:
Parameter Description
DHCP Relay State 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.
DHCP Relay Hops Count
Limit (1-16)
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.
DHCP Relay Time
Threshold (0-65535)
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.
DHCP Relay Option 82
State
This field can be toggled between Enabled and Disabled using the pull-down menu. It
is used to enable or disable the DHCP Relay Agent Information Option 82 on the
Switch. The default is Disabled.
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