3Com 3C17203 - SuperStack 3 Switch 4400, Implementation Manual

Page: 60 / 153

60 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 Switch
management interface via the
bridge addressDatabase remove
CLI
command or the Switch is initialized.