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Bridge Software - PowerPoint PPT Presentation


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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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Presentation Transcript
bridge software
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

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
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
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
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:
what is the problem
What is the problem ?

Bridge 1

0

1

D

A

E

B

F

C

Bridge 2

0

1