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DES-7200 Configuration Guide Chapter 2 MAC Address Configuration
2-11
2.1.4 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.
Caution
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.
For DES-7200 series, only 7200-24, 7200-24G, 7200-48, 7200-48P,
7200-2XG, 7200-4XG, 7200-24GE and 7200-24G2XG line cards
support this function.
2.1.5 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.
By configuring the static address manually, you can bind the MAC address for
the network device with the interface in the MAC address table.
2.1.6 Filtering
Address
A filtering address is a manually configured MAC address When the device
receives the packets from a filtering address, it will directly discard them. You
can only manually add and delete a filtering address rather than age it out. A