( MAC- ) BPDU (bridge protocol data unit)
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( BPDU) , (STP Cost)
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Spanning Tree Protocol
STP Ethernet
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1. (. Root Bridge).
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Port).
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3.
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(. Designated Bridge).
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STP
(root-)
BID (Bridge ID)!
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, (root-)
MAC- , (root)
MAC-.
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(cost) ,
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STP
, (!)
(root).
Hello
BPDU 2 .
Hello BPDU ,
root, .
root port designated port .
Hello- 2 ,
.
11.
(Virtual LAN, VLAN) , ( . . ) .
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VLAN , ,
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