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icnd2:spanning-tree [2024/04/28 06:17]
114.119.158.167 old revision restored (2024/02/14 02:33) 		icnd2:spanning-tree [2024/04/28 21:59]
114.119.145.194 old revision restored (2018/01/13 11:12)
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 =====CONCEPT===== =====CONCEPT=====
-  * It does this with Each Switch broadcasting a **''HELLO BPDU''**, made up of that SW's **''Priority + MAC''**. Default Priority is 32768. The SW with the lowest **''BPDU''** (superior) is elected the ROOT BRIDGE.  +  * It does this with Each Switch broadcasting a **''HELLO BPDU''**, made up of that SW's **''Priority + MAC''**. Default Priority is 32768. The SW with the **''lowest BPDU''** (superior) is elected the ROOT BRIDGE.  
-  * Each SW will then determine a ROOT PORT, one per SW. A DESIGNATED port is then elected on each segment. There can only be one DESIGNATED port per SEGMENT/LINK.  +  * Each SW will then determine a **''ROOT PORT''**, one per SW. A **''DESIGNATED''** port is then elected on each segment.  
-  * Any port that is not DESIGNATED or a ROOT port, is then set to a BLOCKING state. +  * There can only be **one DESIGNATED port per SEGMENT/LINK. ** 
-Note that once a ROOT Bridge is elected, all other bridges will only forward HELLO BPDU's originating from the ROOT BRIDGE. The Root cost is incremented as the HELLO BPDU is received (COST=$COST+$PORT_COST). The Root Cost starts off @ 0 from the ROOT. Each subsequent Bridge tacks on it's COST TO THE ROOT BRIDGE as it is **received**.+  * Any port that is **not** **''DESIGNATED''** or a **''ROOT''** port, is then set to a **''BLOCKING''** state. 
 +Note that once a ROOT Bridge is elected, all other bridges will only forward HELLO BPDU's **originating** from the **''ROOT BRIDGE''**. The Root cost is incremented as the **''HELLO BPDU''** is **received (COST=$COST+$PORT_COST)**. The Root Cost **starts off @ 0** from the **''ROOT''**. Each subsequent Bridge tacks on it's **COST TO THE ROOT BRIDGE** as it is **received**.
  
  
icnd2/spanning-tree.txt · Last modified: 2024/05/14 01:02 by 114.119.137.174

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