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To do… Use the command… Remarks
Display the aging time of the dynamic
MAC address entries in the MAC address
table
display mac-address aging-time
Display the configured start port MAC
address
display port-mac
Configuration Examples
Adding a Static MAC Address Entry Manually
Network requirements
The server connects to the switch through GigabitEthernet 1/0/2. To prevent the switch from
broadcasting packets destined for the server, it is required to add the MAC address of the server to the
MAC address table of the switch, which then forwards packets destined for the server through
GigabitEthernet 1/0/2.
z The MAC address of the server is 000f-e20f-dc71.
z Port GigabitEthernet 1/0/2 belongs to VLAN 1.
z Suppose the MAC address of a host is 000f-e235-abcd and belongs to VLAN 1. Because the host
once behaved suspiciously on the network, you can add a blackhole MAC address entry for the
MAC address to drop all packets destined for the host for security sake.
Configuration procedure
# Enter system view.
<Sysname> system-view
[Sysname]
# Add a MAC address, with the VLAN, ports, and states specified.
[Sysname] mac-address static 000f-e20f-dc71 interface GigabitEthernet 1/0/2 vlan 1
# Add a black hole MAC address 000f-e235-abcd, with the VLAN and ports specified.
[Sysname] mac-address blackhole 000f-e235-abcd interface GigabitEthernet 1/0/2 vlan 1
# Display information about the current MAC address table.
[Sysname] display mac-address interface GigabitEthernet 1/0/2
Unit 1
MAC ADDR VLAN ID STATE PORT INDEX AGING TIME(s)
000f-e20f-dc71 1 Config static GigabitEthernet1/0/2 NOAGED
000f-e235-abcd 1 Blackhole GigabitEthernet1/0/2 NOAGED
000f-e20f-a7d6 1 Learned GigabitEthernet1/0/2 AGING
000f-e20f-b1fb 1 Learned GigabitEthernet1/0/2 AGING
000f-e20f-f116 1 Learned GigabitEthernet1/0/2 AGING
--- 4 mac address(es) found on port GigabitEthernet1/0/2 ---