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BridgesBridges Advanced Advanced Computer Networks.

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Presentation on theme: "BridgesBridges Advanced Advanced Computer Networks."— Presentation transcript:

1 BridgesBridges Advanced Advanced Computer Networks

2 Bridges Outline  Repeaters  Bridges –Backward learning  Bridge Loops –Spanning trees Advanced Computer Networks Bridges 2

3 Repeater S1S2 S3 LAN1LAN2 S4 A repeater operates at the physical layer and forwards everything between the two LANs. LAN1 and LAN2 are in the same collision domain. Repeaters Repeaters Advanced Computer Networks Bridges 3

4 Bridges Bridges Advanced Computer Networks Bridges 4 Bridge Leon-Garcia & Widjaja: Communication Networks

5 Bridges 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. Advanced Computer Networks Bridges 5

6 Bridge Network Physical Network LLC Physical LLC MAC A bridge is a store and forward device that separates collision domains. Bridge Bridge Advanced Computer Networks Bridges 6

7 B1 S1S2 B2 S3S4 S5 Address Port port 1port 2port 1port 2 LAN1LAN2LAN3 Advanced Computer Networks Bridges 7 Bridges Bridges Leon-Garcia & Widjaja: Communication Networks

8 B1 S1S2 B2 S3S4 S5 Address Port port 1port 2port 1port 2 LAN1LAN2LAN3 S1 S5 S11 1 Advanced Computer Networks Bridges 8 Bridges Bridges Leon-Garcia & Widjaja: Communication Networks

9 B1 S1S2 B2 S3S4 S5 Address Port port 1port 2port 1port 2 LAN1LAN2LAN3 S3 S2 S11 1 S32 1 Advanced Computer Networks Bridges 9 Bridges Bridges Leon-Garcia & Widjaja: Communication Networks

10 B1 S1S2 B2 S3S4 S5 Address Port port 1port 2port 1port 2 LAN1LAN2LAN3 S4 S3 S11 1 S32 1 S42 2 Bridge 1 does not forward the frame to LAN1 Advanced Computer Networks Bridges 10 Bridges Bridges Leon-Garcia & Widjaja: Communication Networks

11 Bridge1 S1S2 Bridge 2 S3S4 S5 Address Port port 1port 2port 1port 2 LAN1LAN2LAN3 S2 S1 S11 1 S32 1 S42 2 S21 Bridge 1 does not forward the frame to LAN2 Advanced Computer Networks Bridges 11 Bridges Bridges Leon-Garcia & Widjaja: Communication Networks

12 (1) (2) (3) MAN with Bridge Loops MAN with Bridge Loops Advanced Computer Networks Bridges 12 Leon-Garcia & Widjaja: Communication Networks

13 One solution to bridge loops Build a Spanning Tree! MAN with Bridge Loops MAN with Bridge Loops Advanced Computer Networks Bridges 13 Leon-Garcia & Widjaja: Communication Networks


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