D-Link DES-3010G Reference Manual - Page 71

config fdb aging_time, delete fdb, DES-3026:4#config fdb aging_time 300

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DES-3010F / DES-3010G / DES-3018 / DES-3026 Layer 2 Switch CLI Reference Manual DES-3026:4# config fdb aging_time Purpose Syntax Description Parameters Restrictions Used to set the aging time of the forwarding database. config fdb 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 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 A very long aging time can result in dynamic forwarding table entries that are out-of-date or no longer exist.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. − The aging time for the MAC address forwarding database value, in seconds. 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 Syntax Description Parameters Restrictions Used to delete an entry to the Switch's forwarding database. delete fdb This command is used to delete a previous entry to the Switch's MAC address forwarding database. − The name of the VLAN on which the MAC address resides. − The MAC address that will be added to the forwarding table. 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 69

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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
69