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Bridges
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Figure 6.79
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Bridges Operate at the data link layer Also 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 location of destination node Bridge management gets more complicated when loops are possible in the frame route.
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Bridge Network Physical Network LLC Physical LLC MAC Figure 6.80
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B1 S1S2 B2 S3S4 S5 Address Port port 1port 2port 1port 2 LAN1LAN2LAN3 Figure 6.81
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B1 S1S2 B2 S3S4 S5 Address Port port 1port 2port 1port 2 LAN1LAN2LAN3 S1 S5 S11 1 Figure 6.82
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B1 S1S2 B2 S3S4 S5 Address Port port 1port 2port 1port 2 LAN1LAN2LAN3 S3 S2 S11 1 S32 1 Figure 6.83
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B1 S1S2 B2 S3S4 S5 Address Port port 1port 2port 1port 2 LAN1LAN2LAN3 S4 S3 S11 1 S32 1 S42 2 Figure 6.84
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Bridge1 S1S2 Bridge 2 S3S4 S5 Address Port port 1port 2port 1port 2 LAN1LAN2LAN3 S2 S1 S11 1 S32 1 S42 2 S21 Figure 6.85
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(1) (2) (3) Figure 6.86
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Figure 6.87
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