D-Link DES-1228 Reference Manual page 95

config fdb aging_time
Purpose
Syntax
Description
Parameters
Restrictions
Example usage:
To set the fdb aging time:
DES-1228/ME:4#config fdb aging_time 300
Command: config fdb aging_time 300
Success.
DES-1228/ME:4#
DES-1228/ME Layer 2 Metro Ethernet Switch CLI Reference Manual
Used to set the aging time of the forwarding database.
config fdb aging_time <sec 10-1000000>
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very long aging time can result in dynamic forwarding table entries that are out-of-date or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.
<sec 10-1000000> − The aging time for the MAC address forwarding database value. The
value in seconds may be between 10 and 1000000 seconds.
Only Administrator-level users can issue this command.
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