Browse Prior Art Database

Wireless Bridge Source Address Table Aging Scheme

IP.com Disclosure Number: IPCOM000113649D
Original Publication Date: 1994-Sep-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Dahl, SS: AUTHOR [+2]

Abstract

A method for increasing the data bandwidth for a wireless Local Area Network (LAN) bridge and remain compliant with the 802.1 table aging standard is disclosed.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 57% of the total text.

Wireless Bridge Source Address Table Aging Scheme

      A method for increasing the data bandwidth for a wireless Local
Area Network (LAN) bridge and remain compliant with the 802.1 table
aging standard is disclosed.

      Today, wireless LAN vendors provide multi-cell RF coverage by
adding a personal computer-like bridge (access point) for each new RF
cell.  Each personal computer contains a single wireless LAN adaptor
unit.  Each bridge has a source address table to log the LAN
addresses for both sides of the bridge.  The purpose for a bridge is
to act as a "firewall" between the two LAN segments and pass only
those frames to the LAN segment with those station addresses.  The
effect is unnecessary traffic is kept to a minimum.  The source
address table has an "aging mechanism" which tracks the addresses
within the table by time.  If an address is not used for some period
of time, the bridge will delete that address from the table.  An
example of this would be a terminal powered down.  "Aging" is used to
free up source address spaces within the table for other stations to
use.  It's common for a bridge to have 1000 source table locations
yet have more then 1000 stations on the LAN segment.  For a LAN
bridge to offer roaming capability, the source address table "aging"
scheme is no longer effective.  The reason is as the station moves
from one cell to an adjacent cell, the source address tables for both
bridges will contain the same station address.  Th...