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icnd2:spanning-tree [2024/04/26 15:14] 114.119.130.33 old revision restored (2023/11/09 05:52) |
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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=====WHY===== | =====WHY===== | ||
- | Frame Loop Prevention Mechanism. Achieved by blocking all but one ROOT port to a ROOT switch. Redundant links are then blocked to create a loop-free environment. | + | Frame Loop Prevention Mechanism. Achieved by blocking all but one **'' |
=====CONCEPT===== | =====CONCEPT===== | ||
- | * It does this with Each Switch broadcasting a 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 **'' |
- | * 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/ | + | * Each SW will then determine a **'' |
- | * 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/ |
+ | * Any port that is **not** **'' | ||
+ | Note that once a ROOT Bridge is elected, all other bridges will only forward HELLO BPDU's **originating** from the **'' | ||
==TO DETERMINE A DESIGNATED PORT:== | ==TO DETERMINE A DESIGNATED PORT:== | ||
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Vlan | Vlan | ||
---------------- --------------------------------- ----- --- --- -------- | ---------------- --------------------------------- ----- --- --- -------- | ||
- | VLAN0001 | + | VLAN0001 |
VLAN0002 | VLAN0002 | ||