xStack DES-6500 Modular Layer 3 Chassis Ethernet Switch CLI Manual
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 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dynamic forwarding table entries that are out-of-date or no longer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. The value in seconds may be between
10 and 1000000 seconds. The default is 300 seconds.
Only
administrator-level users can issue this command.
Restrictions
Example usage:
To set the fdb aging time:
DES-6500:4#config fdb aging_time 300
Command: config fdb aging_time 300
Success.
DES-6500:4#
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 deleted from the
forwarding table.
Restrictions Only
administrator-level users can issue this command.
Example usage:
To delete a permanent FDB entry:
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