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2.3
MAC address table management
2.3.1
management
System maintains a MAC address table which is used to transfer packet. The item of this table contains MAC
address, VLAN ID and interface number of packet entering. When a packet entering switch, switch will look up the
MAC address tablke according to destination MAC and VLAN ID of the packet. If it is found out, send packet
according to the specified interface in the item of MAC address table, or the packet will be broadcasted in this
VLAN. In SVL learning mode, look up the table only according to MAC in packet and neglect VLAN ID.
System possesses MAC address learning. If the source MAC address of the received packet does not existed
in MAC address table, system will add source MAC address, VLAN ID and port number of receiving this packet as a
new item to MAC address table.
MAC address table can be manual configured. Administrator can configure MAC address table according to
the real situation of the network. Added or modified item can be static, permanent, blackhole and dynamic.
System can provide MAC address aging. If a device does not receive any packet in a certain time, system will
delete related MAC address table item. MAC address aging is effective on (dynamic) MAC address item which can
be aging by learning or user configuration.
2.3.2
MAC address table management
·
Configure system MAC address aging time
·
Configure MAC address item
·
Enable/disable MAC address learning
·
Modify MAC address learning mode
2.3.3
Use mac-address-table age-time command in global configuration mode to configure MAC address aging
time. Use no mac-address age-time command to restore it to default time.
mac-address-table age-time { agetime | disable }
no mac-address-table age-time
Agetime means MAC address aging time which ranges from 1 to 1048575 seconds. Default MAC address
aging time is 300 seconds. Disable means MAC address not aging. Use no command to restore the default MAC
address aging time.
For example:
! Configure MAC address aging time to be 3600 seconds
QTECH(config)#mac-address-table age-time 3600
! Restore MAC address aging time to be 300 seconds
QTECH(config)#no mac-address-table age-time
Display MAC address aging time
Brief
introduction
MAC address table management list
Configure system MAC address aging time
of
MAC
2-25
address
table
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