46 CHAPTER 5: USING THE SWITCH DATABASE
Switch Database 
Entry States
Databases entries can have three states:
■ Learned — The Switch has placed the entry into the Switch Database 
when a packet was received from an endstation. Note that:
■ Learned entries are removed (aged out) from the Switch Database 
if the Switch does not receive further packets from that endstation 
within a certain period of time (the aging time). This prevents the 
Switch Database from becoming full with obsolete entries by 
ensuring that when an endstation is removed from the network, its 
entry is also removed from the database. 
■ Learned entries are removed from the Switch Database if the 
Switch is reset or powered-down. 
■ Non-aging learned — If the aging time is set to 0 seconds, all learned 
entries in the Switch Database become non-aging learned entries. This 
means that they are not aged out, but they are still removed from the 
database if the Switch is reset or powered-down. 
■ Permanent — The entry has been placed into the Switch Database 
using the management interface. Permanent entries are not removed 
from the Switch Database unless they are removed using the Switch 
management interface via the bridge > addressDatabase > remove 
Web operation or the Switch is initialized.