D-Link DGS-3000 Reference Manual page 357

DGS-3000 Series Layer 2 Managed Gigabit Ethernet Switch CLI Reference Guide
Parameters
<vlan_name 32> - Enter the VLAN name on which the MAC address resides. The maximum
name length is 32.
<macaddr> - Enter the MAC address that will be added or deleted to the forwarding table.
add - Specify to add ports to the multicast forwarding table.
delete - Specify to remove ports from the multicast forwarding table.
<portlist> - Enter a range of ports to be configured.
Restrictions
Only Administrators, Operators and Power-Users can issue this command.
Example
To add a multicast MAC forwarding entry to the default VLAN on port 1 to 5:
DGS-3000-26TC:admin#config multicast_fdb default 01-00-5E-00-00-00 add 1-5
Command: config multicast_fdb default 01-00-5E-00-00-00 add 1-5
Success.
DGS-3000-26TC:admin#
33-5 config fdb aging_time
Description
This command is used to configure the MAC address table aging time. The aging time affects the
learning process of the Switch. Dynamic forwarding table entries, which are made up of the source
MAC addresses and their associated port numbers, are deleted from the table if they are not
accessed within the aging time. The aging time can be from 10 to 1000000 seconds with a default
value of 300 seconds. A very long aging time can result in dynamic forwarding table entries that
are out-of-date or no longer exist. This may cause incorrect packet forwarding decisions by the
Switch. If the aging time is too short however, many entries may be aged out too soon. This will
result in a high percentage of received packets whose source addresses cannot be found in the
forwarding table, in which case the Switch will broadcast the packet to all ports, negating many of
the benefits of having a switch.
Format
config fdb aging_time <sec 10-1000000>
Parameters
<sec 10-1000000> - Enter the FDB age out time between 10 to 1000000 seconds.
Restrictions
Only Administrators, Operators and Power-Users can issue this command.
Example
To configure the MAC address table aging time to 600 seconds:
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