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icnd2:spanning-tree [2024/04/24 12:05]
114.119.130.33 old revision restored (2023/11/10 05:31) 		icnd2:spanning-tree [2024/05/15 02:53] (current)
114.119.138.183 old revision restored (2024/02/13 19:32)
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   * There can only be **one DESIGNATED port per SEGMENT/LINK. **   * There can only be **one DESIGNATED port per SEGMENT/LINK. **
   * Any port that is **not** **''DESIGNATED''** or a **''ROOT''** port, is then set to a **''BLOCKING''** state.   * 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**.+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**. 
  
 ==TO DETERMINE A DESIGNATED PORT:== ==TO DETERMINE A DESIGNATED PORT:==
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   * --COST IS SAME: Is my my Bridge ID lower?   * --COST IS SAME: Is my my Bridge ID lower?
   * --if NO to either, PORT WILL BE BLOCKED!   * --if NO to either, PORT WILL BE BLOCKED!
- 
-==PORT COSTS== 
-  * **10Mb link:** **''100''** 
-  * **100Mb link:** **''19''** 
-  * **1Gb Link:** **''4''** 
- 
-=====Root Port Election===== 
-SW1 <> SW2 (Fa0/11-> Fa0/11, Fa0/12 -> Fa0/12) 
- 
-The BPDU with the lowest **''Root Port Cost (RPC)''** will be elected the **''Root Port''**. Considering the above topology, both ports being received on FastEthernet ports will have a cost of 19 added to the RPC once it hits SW2. The RPC will match on both interfaces. A tie-breaker is required to further determine the Root Port. 
- 
-The **''port''** that recieves the **''lowest BPDU''** is **''elected''** the root port. Considering the above topology, SW2 will receive the same BPDU from SW1 on BOTH PORTS. With the BPDU the same, it ties. A tie-breakier is needed to determine the **''ROOT PORT''**. 
-====Tie Breakers==== 
-stuff 
  
 =====COMMANDS:===== =====COMMANDS:=====
icnd2/spanning-tree.1713960321.txt.gz · Last modified: 2024/04/24 12:05 by 114.119.130.33

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