D-Link DES-3528 - xStack Switch - Stackable, Руководство пользователя, Страница: 145 / 322

xStack
®
DES-3528/DES-3552 Series Layer 2 Stackable Fast Ethernet Managed Switch User Manual
144
Parameter Description
IP Address
The IPv4 address of the Default Route.
Subnet Mask
The corresponding Subnet Mask of the IP address entered into the table.
Gateway
The corresponding Gateway of the IP address entered into the table.
Metric (1-655635)
Represents the metric value of the IP interface entered into the table. This field may read a
number between 1-65535.
Click
Apply
to implement changes made.
Gratuitous ARP
Gratuitous ARP Global Settings
An ARP announcement (also known as Gratuitous ARP) is a packet (usually an ARP Request) containing a valid SHA
and SPA for the host which sent it, with TPA equal to SPA. Such a request is not intended to solicit a reply, but merely
updates the ARP caches of other hosts which receive the packet.
This is commonly done by many operating systems on startup, and helps to resolve problems which would otherwise
occur if, for example, a network card had recently been changed (changing the IP address to MAC address mapping)
and other hosts still had the old mapping in their ARP cache.
To view this window, click
L3 Features > Gratuitous ARP > Gratuitous ARP Global Settings
as shown below:
Figure 4 - 5 Gratuitous ARP Global Settings window
The following fields can be configured:
Parameter Description
Send On IP
Interface Status Up
This is used to enable/disable the sending of gratuitous ARP request packets while an IP
interface comes up. This is used to automatically announce the interface’s IP address to other
nodes. By default, the state is
Disabled , and only one ARP packet will be broadcasted.
Send On Duplicate
IP Detected
This is used to enable/disable the sending of gratuitous ARP request packets while a duplicate
IP is detected. By default, the state is
Disabled . Duplicate IP detected means that the system
received an ARP request packet that is sent by an IP address that matches the system’s own
IP address.
Gratuitous ARP
Learning
This is used to enable/disable updating ARP cache based on the received gratuitous ARP
packet. If a switch receives a gratuitous ARP packet, it should add or update the ARP entry.
This is
Disabled by default.
Once you have made the desired gratuitous ARP setting changes, click
Apply
.