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Command: show mac-address-table [static|aging-time|discard] [address
<mac-addr>] Function: Show the current MAC table
Parameter: static static entry; aging-time address aging time; discardiia filter entry;
<mac-addr> entry’s MAC address; <vlan-id> entry’s VLAN number; <interface-name>
entry’s interface name
Command mode: Admin mode
Default: MAC address table is not displayed by default.
Usage guide: This command can display various sorts of MAC address entries. Users
can also use show mac-address-table to display all the MAC address entries.
Example: Display all the filter MAC address entries.
Switch#show mac-address-table discardish
4.4.2 Troubleshooting Help
Using the show mac-address-table command, a port is found to be failed to learn the
MAC of a device connected to it. Possible reasons:
) The connected cable is broken, replace the cable.
) Spanning Tree is started and the port is in “discarding” status; or the device is just
connected to the port and Spanning Tree is still under calculation, wait until the
Spanning Tree calculation finishes, and the port will learn the MAC address.
) If not the abovementioned problem, please check for port healthy and contact
technical support for solution for port problems.
4.5 MAC Address Function Extension
4.5.1 MAC Address Binding
4.5.1.1 Introduction to MAC Address Binding
Most switches support MAC address learning, each port can dynamically learn
several MAC addresses, so that forwarding data streams between known MAC addresses
within the ports can be achieved. If a MAC address is aged, the packet destined for that
entry will be broadcasted. In other words, a MAC address learned in a port will be used for
forwarding in that port, if the connection is changed to another port, the switch will learn