Filtering Database - D-Link DES-3624 Series User Manual

address, are aged out of the address table according to the
Aging Time that you set.
The Aging Time can be from 10 seconds to 9999 seconds. A
very long Aging Time can result with the out-of-date Dynamic
Entries that may cause incorrect packet filtering/forwarding
decisions.
On the other hand, if the Aging Time is too short, many entries
may be aged out soon, resulting in a high percentage of
received packets whose source addresses cannot be found in
the address table, in which case the Switch will broadcast the
packet to all ports, negating many of the benefits of having a
switch.

Filtering Database

A switch uses a filtering database to segment the network
and control communications between segments. It also
filters packets off the network for intrusion control (MAC
Address filtering).
For port filtering, each port on the switch is a unique
collision domain and the switch filters (discards) packets
whose destination lies on the same port as where it
originated. This keeps local packets from disrupting
communications on other parts of the network.
For intrusion control, whenever a switch encounters a
packet originating from or destined to a MAC address
defined by the user, the switch will discard the packet.
Filtering includes:
1. Dynamic filtering Automatic learning and aging of MAC
addresses and their location on the network. Filtering
occurs to keep local traffic confined to its segment.
Switch Management Concepts
Stackable NWay Ethernet Switch User's Guide
35