Configuration Guide Configuring MAC Address
2.2.2 MAC Address Change Notification
MAC address change notification provides a mechanism for the network management system (NMS) to monitor the change
of devices connected to a network device.
Scenario
Figure 2-5 MAC Address Change Notification
After MAC address change notification is enabled on a device, the device generates a notification message when the device
learns a new MAC address or finishes aging a learned MAC address, and sends the message in an SNMP Trap message to
a specified NMS.
A notification of adding a MAC address indicates that a new user accesses the network, and that of deleting a MAC address
indicates that a user sends no packets within an aging time and usually the user exits the network.
When a network device is connected to a number of devices, a lot of MAC address changes may occur in a short time,
resulting in an increase in traffic. To reduce traffic, you may configure an interval for sending MAC address change
notifications. When the interval expires, all notifications generated during the interval are encapsulated into a message.
When a notification is generated, it is stored in the table of historical MAC address change notifications. The administrator
may know recent MAC address changes by checking the table of notification history even without NMS.
A MAC address change notification is generated only for a dynamic MAC address.
Deployment
Enable MAC address change notification on a layer-2 switch to monitor the change of devices connected to a network
device.
2.3 Features
Basic Concepts
Dynamic MAC Address
A dynamic MAC address is a MAC address entry generated through the process of MAC address learning by a device.
Address Aging
To Next Page
Loading...
Need help?
General
