Dhcp/Bootp Relay; Dhcp / Bootp Relay Global Settings - D-Link DES-3526 - Switch - Stackable User Manual

xStack
Gratuitous ARP
Learning
Gratuitous ARP
Trap & Log
Gratuitous ARP
Periodical Send
Interval
After making the desired changes, click Apply to implement the new Gratuitous ARP Table entry.

DHCP/BOOTP Relay

The relay hops count limit allows the maximum number of hops (routers) that the DHCP/BOOTP 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 second field of the packet is less than the relay time threshold, the
packet will be dropped. The range is between 0 and 65535 seconds, with a default value of 0 seconds.

DHCP / BOOTP Relay Global Settings

To enable and configure DHCP/BOOTP Relay Global Settings on the Switch, click Configuration > Layer 3 IP Networking >
DHCP/BOOTP Relay > DHCP/BOOTP Relay Global Settings:
The following fields can be set:
Parameter
Relay State
Relay Hops Count
Limit (1-16)
Relay Time Threshold
(0-65535)
DHCP Agent
Information Option 82
State
®
DES-3500 Series Layer 2 Stackable Fast Ethernet Managed Switch User Manual
This is used to enable/disable updating ARP cache based on the received gratuitous ARP
packet. If a switch receives a gratuitous ARP packet and the sender's IP address in its ARP
table, it should update the ARP entry. This is Enabled by default.
The switch can trap and log IP conflict events to inform the administrator. By default, trap is
Disabled and event log is Enabled.
This is used to configure the interval for the periodical sending of gratuitous ARP request
packets. By default, the interval is 0.
Figure 6- 120. DHCP/ BOOTP 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/BOOTP 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/BOOTP messages can be forwarded across. The default hop count is 4.
Allows an entry between 0 and 65535 seconds, and defines the maximum time limit for
routing a DHCP/BOOTP packet. If a value of 0 is entered, the Switch will not process the
value in the seconds field of the BOOTP or 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 BOOTP or DHCP packet.
This field can be toggled between Enabled and Disabled using the pull-down menu. It is
used to enable or disable the DHCP Agent Information Option 82 on the Switch. The
default is Disabled.
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