The Changing Notification Of The Mac Address; Overview - D-Link xStack DGS-3610 Series Configuration Manual

Chapter 13 MAC Address Configuration
Caution
Show the setting of address aging time:
DGS-3610# show mac-address-table aging-time
Aging time
13.2 The Changing Notification of the
MAC Address
13.2.1

Overview

If you want to know the situation of user changes in the network for the device, the MAC
address notification is an effective function. After the function of MAC address notification is
enabled, whenever the device learns or removes a MAC address, a notification reflecting the
MAC address change can be generated and sent to the NMS (Network Management
Workstation) with the form of SNMP Trap. If a notification about adding MAC address has
been generated, you know a new user (marked by the MAC address) is using the device. If a
notification about deleting MAC address (if there is no communication in the specified time
according to the aging time between the switch with the user, the address of the user will be
deleted from the address table on the device) has been generated, you know that a user
does not use the device any more.
When many users use the device, it's possible to generate lots of MAC address changes
within a short time (for example when the device is powered on), resulting in increase of the
network traffic. In order to decrease the network load, you can set the time interval of
sending MAC address notifications. The specified information of the address notification
within the interval will be bound by the system. Thus, some information of MAC address
changes are contained in each messages of address notification so as to decrease the
network traffic.
At the same time when the MAC address notifications are generated, the notification
information will be recorded in the MAC address notification history list. If you do not
configure the NMS for receiving the traps or you do not receive the Traps in time, you can
know the latest MAC address changing information by viewing the MAC address notification
history list.
MAC address notification function is based on the interface. But the MAC address
notification has a global switch. When the global switch is disabled, the MAC address
notification will not be generated on all interfaces. This interface will generate a MAC
address change notification only when the global switch is turned on and the MAC address
change function on the interface is enabled. No notification will be generated when there is
MAC address change on the interface with the disabled notification function. You can set the
interface to send either of address increase or decrease notification, or send both.
13-6
The total address space of the MAC address table available on the DGS-3610
series devices is 16384.
: 300
DGS-3610 Series Configuration Guide