D-Link DES-3250TG Reference Manual page 104

DES-3250TG Layer 2 Fast Ethernet Switch User's Guide
Egress Ports : 1-5, 26
Mode : Static
Total Entries : 1
local>
config fdb aging_time
Purpose Used to set the aging time of the forwarding
database.
config fdb aging_time <sec>
Syntax
Description 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 1,000,000
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are out-of-date or no longer exist.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
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
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
incorrect packet forwarding
of received packets
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