DES-3010F / DES-3010G / DES-3018 / DES-3026 Layer 2 Switch CLI Reference Manual
DES-3026:4#
config fdb aging_time
Purpose Used to set the aging time of the forwarding database.
Syntax
config fdb aging_time <sec 10-1000000>
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 1000000 seconds with a default value of 5
minutes (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forwarding table entries that are out-of-date or no longer exist.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.
Parameters
<sec 10-1000000> − The aging time for the MAC address
forwarding database value, in seconds.
Restrictions Only administrator-level users can issue this command.
Example usage:
To set the fdb aging time:
DES-3026:4#config fdb aging_time 300
Command: config fdb aging_time 300
Success.
DES-3026:4#
delete fdb
Purpose Used to delete an entry to the Switch’s forwarding database.
Syntax
delete fdb <vlan_name 32> <macaddr>
Description This command is used to delete a previous entry to the Switch’s
MAC address forwarding database.
Parameters
<vlan_name 32> − The name of the VLAN on which the MAC
address resides.
<macaddr> − The MAC address that will be added to the forwarding
table.
Restrictions Only administrator-level users can issue this command.
Example usage:
To delete a permanent FDB entry:
DES-3026:4#delete fdb default 00-00-00-00-01-02
Command: delete fdb default 00-00-00-00-01-02
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