Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Transparent Bridge Database Aging Process

IP.com Disclosure Number: IPCOM000108102D
Original Publication Date: 1992-Apr-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 3 page(s) / 101K

Publishing Venue

IBM

Related People

Coates, JW: AUTHOR [+4]

Abstract

In a Transparent Bridge environment, a workstation address table is used as frame filtering and forwarding database. For every incoming frame, the bridge port received, the frame's destination address (DA), source address (SA), its receiving bridge port ID and the frame format type are matched against the database workstation address entries. The frame filtering and forwarding decision is made based on the DA match result. Any SA match result is used for database update and maintenance purposes. The LAN workstation status and the network topology may change over time. The database, therefore, needs to be updated periodically in order to keep up with record changes in the network. A microprocessor (uP) system (Fig. 1) is normally used to handle the bridge management functions.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Transparent Bridge Database Aging Process

       In a Transparent Bridge environment, a workstation
address table is used as frame filtering and forwarding database. For
every incoming frame, the bridge port received, the frame's
destination address (DA), source address (SA), its receiving bridge
port ID and the frame format type are matched against the database
workstation address entries. The frame filtering and forwarding
decision is made based on the DA match result.  Any SA match result
is used for database update and maintenance purposes.  The LAN
workstation status and the network topology may change over time.
The database, therefore, needs to be updated periodically in order to
keep up with record changes in the network.  A microprocessor (uP)
system (Fig. 1) is normally used to handle the bridge management
functions.  Updating the database is part of the uP's
responsibilities.  Tasks, such as adding "new" workstations
(addresses) and their routing parameters to the database, tracking
and updating changes occurred on the existing notes, and deleting
stations that are no longer active from the table, can be intense and
need to be carried out periodically.  This "birth and aging" process
continues as long as the bridge is in operation.

      Bridge Management Tags (BMTs) are introduced to help the aging
process.  For each workstation address database entry, a BMT is
attached.  The BMT has three sub-tags:  the Permanent entry member
identifier ("P"); the entry in use ("U"); the Time-stamped tag ("T").
The "P" tag used to identify that the entry is a non-aging entry.
The "U" tag is used to indicate that this database entry is in
operation.
The "T" tag is used to flag that this workstation is still active.

      NEW workstation is normally defined as:
      1.   No SA and database entry mat...