D-Link xStack DGS-3426 Cli Manual page 86

config fdb aging_time
Purpose
Syntax
Description
Parameters
Restrictions
Example usage:
To set the FDB aging time:
delete fdb
Purpose
Syntax
Description
Parameters
Restrictions
Example usage:
To delete a permanent FDB entry:
DGS-3400:4#delete fdb default 00-00-00-00-01-02
Command: delete fdb default 00-00-00-00-01-02
Success.
DGS-3400:4#
Example usage:
To delete a multicast FDB entry:
xStack DGS-3400 Series Layer 2 Gigabit Managed Switch CLI 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table entries that are out-of-date or no longer exist.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.
DGS-3400:4#config fdb aging_time 300
Command: config fdb aging_time 300
Success.
DGS-3400:4#
Used to delete an entry to the Switch's forwarding database.
delete fdb <vlan_name 32> <macaddr>
This command is used to delete a previous entry to the Switch's
MAC address forwarding database.
<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.
Only administrator-level users can issue this command.
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