MAC Learning

A switch can learn source MAC addresses of data frames. After learning the interface connected to the destination host, the switch sends data frames to the interface instead of broadcasting data frames to all interfaces in the VLAN.

Context

By learning MAC addresses, a switch can obtain MAC addresses of devices on the network connected to an interface.

Procedure

Query MAC address learning on an interface.
1. Choose Service Management > MAC > MAC Learning in the navigation tree to open the MAC Learning page.
2. Set the search criteria.
3. Click Query. The search results are displayed.

Configure MAC address learning on an interface.

Choose Service Management > MAC > MAC Learning in the navigation tree to open the MAC Learning page.

In the Configure MAC Learning on Interface group box, select a record and click Configure. The Configure Dynamic MAC Learning page is displayed.

Table 1 describes the parameters on the Configure Dynamic MAC Learning page.

**Table 1** Configure Dynamic MAC Learning on interface
Parameter	Description
Interface name	Indicates the name of an interface. The interface name cannot be modified. You can select multiple interfaces each time. If only one interface is selected, the configuration of the interface is displayed. If multiple interfaces are selected, the default settings of the interfaces are displayed.
MAC learning	Indicates whether to enable MAC address learning.
Packet drop	Indicates whether packets are discarded or forwarded when MAC address learning is disabled.
Max MAC entries to be learned	Indicates the maximum number of MAC addresses that an interface can learn. This parameter limits the number of entries in the MAC table. NOTE: After the sticky MAC function is enabled on the interface, Max MAC entries to be learned and Actions for exceeding the MAC limit become unavailable.
Actions for exceeding the MAC limit	Indicates the action performed when the number of MAC entries reaches the limit. The options are Forward and Discard.

Set the parameters.
Click OK.
NOTE:
To cancel the MAC address learning limit on an interface, select the corresponding record on the MAC Learning page and click Cancel Limit.

Query MAC address learning on a VLAN.
1. Choose Service Management > MAC > MAC Learning in the navigation tree to open the MAC Learning page.
2. Set the search criteria.
3. Click Query. The search results are displayed.

Configure MAC address learning on a VLAN.

Choose Service Management > MAC > MAC Learning in the navigation tree to open the MAC Learning page.

In the Configure MAC Learning on VLAN group box, select a record and click Configure. The Configure Dynamic MAC Learning page is displayed.

Table 2 describes the parameters on the Configure Dynamic MAC Learning page.

**Table 2** Configure Dynamic MAC Learning on VLAN
Parameter	Description
VLAN ID	Indicates VLAN ID. The VLAN ID cannot be modified. You can select multiple interfaces each time. If only one interface is selected, the configuration of the interface is displayed. If multiple interfaces are selected, the default settings of the interfaces are displayed.
MAC learning	Indicates whether to enable MAC address learning.
Max MAC entries to be learned	Indicates the maximum number of MAC addresses that an VLAN can learn. This parameter limits the number of entries in the MAC table.

Set the parameters.
Click OK.
NOTE:
To cancel the MAC address learning limit in a VLAN, select the corresponding record on the MAC Learning page and click Cancel Limit.