3Com 3C17300A Implementation Guide - Page 50

Switch Database Entry States, means that they are not aged out, but they are still removed from

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50 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 bridge addressDatabase remove CLI command or the Switch is initialized.

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50
C
HAPTER
5: U
SING
THE
S
WITCH
D
ATABASE
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
bridge
addressDatabase remove
CLI command or the Switch is initialized.