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Bridges. Computer Networks. Bridges Outline. Repeaters Bridges Backward learning Bridge Loops Spanning trees (transparent bridges) Source-routing bridges (e.g., token rings). Repeaters. S4. S1. S2. S3. LAN1. LAN2. Repeater.

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Bridges

Bridges

Computer Networks


Bridges outline
Bridges Outline

  • Repeaters

  • Bridges

    • Backward learning

  • Bridge Loops

    • Spanning trees (transparent bridges)

    • Source-routing bridges (e.g., token rings)

Computer Networks Bridges


Repeaters

S4

S1

S2

S3

LAN1

LAN2

Repeater

A repeater operates at the physical layer and forwards

everything between the two LANs.

LAN1 and LAN2 are in the same collision domain.

Computer Networks Bridges


Bridges

Bridge

Leon-Garcia & Widjaja:

Communication Networks

Computer Networks Bridges


Bridges1
Bridges

  • Operate at the data link layer.

  • Bridges use backward learning in recording source address on transmissions.

  • Unlike repeaters, bridges will not forward a frame onto another LAN segment if it knows about the location of the destination node.

  • Bridge management gets more complicated when loops are possible in the frame route.

Computer Networks Bridges


Bridge

Network

Network

Bridge

LLC

LLC

MAC

MAC

MAC

MAC

Physical

Physical

Physical

Physical

A bridge is a store and forward device that separates collision domains.

Computer Networks Bridges


Bridges

S5

S1

S2

S3

S4

LAN1

LAN2

LAN3

B1

B2

port 1

port 2

port 1

port 2

Address Port

Address Port

Leon-Garcia & Widjaja:

Communication Networks

Computer Networks Bridges


Bridges

S5

S1

S2

S3

S4

S1 S5

LAN1

LAN2

LAN3

B1

B2

port 1

port 2

port 1

port 2

Address Port

Address Port

S1

1

S1

1

Leon-Garcia & Widjaja:

Communication Networks

Computer Networks Bridges


Bridges

S5

S1

S2

S3

S4

S3 S2

LAN1

LAN2

LAN3

B1

B2

port 1

port 2

port 1

port 2

Address Port

Address Port

S1

1

S1

1

S3

2

1

S3

Leon-Garcia & Widjaja:

Communication Networks

Computer Networks Bridges


Bridges

S5

S1

S2

S3

S4

S4 S3

LAN1

LAN2

LAN3

B1

B2

port 1

port 2

port 1

port 2

Address Port

Address Port

Bridge 1 does not

forward the

frame to LAN1

S1

1

S1

1

S3

2

1

S3

2

S4

S4

2

Leon-Garcia & Widjaja:

Communication Networks

Computer Networks Bridges


Bridges

S5

S1

S2

S3

S4

S2 S1

LAN1

LAN2

LAN3

Bridge1

Bridge 2

port 1

port 2

port 1

port 2

Address Port

Address Port

Bridge 1 does not

forward the

frame to LAN2

S1

1

S1

1

S3

2

1

S3

2

S4

S4

2

S2

1

Leon-Garcia & Widjaja:

Communication Networks

Computer Networks Bridges


LAN1

(1)

(1)

B1

B2

(2)

B3

LAN2

B4

LAN3

B5

LAN4

MAN with Bridge Loops

(1)

(2)

(3)

(2)

(1)

(2)

(1)

(2)

Leon-Garcia & Widjaja:

Communication Networks

Computer Networks Bridges


MAN with Bridge Loops

One solution to

bridge loops

Build a Spanning Tree!

Leon-Garcia & Widjaja:

Communication Networks

Computer Networks Bridges


Bridges summary
Bridges Summary

  • Repeaters

  • Bridges

    • Backward learning

  • Bridge Loops

    • Spanning trees (transparent bridges)

    • Source-routing bridges (e.g., token rings)

Computer Networks Bridges


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