2-12 MAC Information ConfigurationWhen configuring MAC Information, go to these sections for information you are interested in:z Overviewz Configuring MAC Informationz MAC Information Configuration ExampleOverviewIntroduction to MAC InformationTo monitor a network, you need to monitor users joining and leaving the network. Because a MACaddress uniquely identifies a network user, you can monitor users joining and leaving a network bymonitoring their MAC addresses.With the MAC Information function, Layer-2 Ethernet interfaces send Syslog or Trap messages to themonitor end in the network when they learn or delete MAC addresses. By analyzing these messages,the monitor end can monitor users accessing the network.How MAC Information WorksWhen a new MAC address is learned or an existing MAC address is deleted on a device, the devicewrites related information about the MAC address to the buffer area used to store user information.When the timer set for sending MAC address monitoring Syslog or Trap messages expires, or when thebuffer is used up, the device sends the Syslog or Trap messages to the monitor end immediately.Configuring MAC InformationThe MAC Information configuration tasks include:z Enabling MAC Information Globallyz Enabling MAC Information on an Interfacez Configuring MAC Information Modez Configuring the Interval for Sending Syslog or Trap Messagesz Configuring the MAC Information Queue LengthEnabling MAC Information GloballyFollow these steps to enable MAC Information globally:To do… Use the command… RemarksEnter system view system-view —Enable MACInformation globally mac-address information enable RequiredDisabled by default
