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Bridge Software PowerPoint PPT Presentation

Bridge Software A bridge connects networks and forwards frames from one network to another. PORTS A B E F BRIDGE C D G H A B E F BRIDGE C D G H Selective Forwarding If A sends a frame to E - the frame must be forwarded by the bridge.

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Bridge Software

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Bridge software l.jpg

Bridge Software

  • A bridge connects networks and forwards frames from one network to another.

PORTS

A

B

E

F

BRIDGE

C

D

G

H


Selective forwarding l.jpg

A

B

E

F

BRIDGE

C

D

G

H

Selective Forwarding

  • If A sends a frame to E - the frame must be forwarded by the bridge.

  • If A sends a frame to B - there is no reason to forward the frame.


Bridge database l.jpg

Bridge Database

  • The bridge needs a database that contains information about which hosts are on which network.

  • The realistic options are:

    • The system administrator can create and maintain the database.

    • The bridge can acquire the database on the fly.

Hard to add new computers

Some loss of efficiency


Learning the host mapping l.jpg

Learning the host mapping

  • The bridge forwards packets for which it does not know which network the destination is on.

  • Everytime the bridge forwards a packet it can record the network on which the sender is located.

  • Each host mapping expires when it is unused for a “long” period of time.


Learning bridge l.jpg

Learning Bridge

  • A host can be moved to another network.

  • New hosts can be added at any time.

  • Requires no setup information from humans.

  • One MAJOR flaw:


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What is the problem ?

Bridge 1

0

1

D

A

E

B

F

C

Bridge 2

0

1


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