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For more information about SNMP and information center configuration, see the network
management and monitoring configuration guide for the device.
To enable SNMP notifications for the MAC address table:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enable SNMP
notifications for the
MAC address table.
snmp-agent trap enable
mac-address
[
mac-move
]
By default, SNMP notifications are enabled
for the MAC address table.
When SNMP notifications are disabled for the
MAC address table, syslog messages are
sent to notify important events on the MAC
address table module.
Displaying and maintaining the MAC address
table
Execute display commands in any view.
Task Command
Display MAC address table
information.
display mac-address
[ mac-address [
vlan
vlan-id ] | [ [
dynamic
|
static
] [
interface
interface-type interface-number ] | blackhole |
multiport
] [
vlan
vlan-id ] [
count
] ]
Display the aging timer for dynamic
MAC address entries.
display mac-address aging-time
Display the system or interface MAC
address learning state.
display mac-address mac-learning
[
interface
interface-type
interface-number ]
Display MAC address statistics.
display mac-address statistics
Display the MAC address move
records.
display mac-address mac-move
[
slot
slot-number ]
MAC address table configuration example
Network requirements
As shown in Figure 6:
• Host A at MAC address 000f-e235-dc71 is connected to Ten-GigabitEthernet 1/0/1 of Device
and belongs to VLAN 1.
• Host B at MAC address 000f-e235-abcd, which behaved suspiciously on the network, also
belongs to VLAN 1.
Configure the MAC address table as follows:
• To prevent MAC address spoofing, add a static entry for Host A in the MAC address table of
Device.
• To drop all frames destined for Host B, add a blackhole MAC address entry for Host B.
• Set the aging timer to 500 seconds for dynamic MAC address entries.
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