Configuration Guide MAC Address Configuration
The disadvantages of the MAC address synchronization:
Occupy the large space of the MAC address table: Even though two users
exchange the packets on the same line card, the MAC address space of
other line cards will also be occupied.
Decrease the System Performance: The system performance is decreased
and it needs the extra synchronous expenditure because the line card
adopts the non-dispersive MAC address learning mode.
With the dynamic MAC address synchronization enabled, every
time the address learning or address aging occurs, the
corresponding operation is executed by the switch. Frequent
address learning or address aging in a short time consumes a lot
of CPU resources, which results in the high utilization of CPU. The
administrator shall enable this function prudently.
Limit of Dynamic Addresses for a VLAN
The capacity of the MAC address table on the Ethernet switch is limited and
shared by all VLANs. To prevent large amout of dynamic addresses in a VLAN
from occupying the whole MAC address table and disabling other VLANs to
learn the dynamic addresses which leads the packets in other VLANs to be
forwarded in the broadcast way, the switch provides the limit of dynamic
addresses for a VLAN. The user can specify the number of dynamic addresses
learned in each VLAN and configure the upper limit of dynamic addresses for
each VLAN.
For the VLAN with the limit of dynamic addresses configured, only the
specified MAC addresses can be learned. The MAC addresses that exceeds
the upper limit are not learned and the packets destined to those MAC
addresses are forwarded in the broadcast form.
If the upper limit of the dynamic addresses for a VLAN is less than
the number of the learned dynamic addresses in the current VLAN,
the Ethernet switch no longer learns the address in the VLAN and
learns again untill the the number of the addresses is less than the
upper limit due to the address aging and deletion.
Static Address
A static address is a manually configured MAC address. A static address is the
same as a dynamic address in terms of funciton. However, you can only
manually add and delete a static address rather than learn and age out a static
address. A static address is stored in the configuration file and will not be lost
even if the device restarts.
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