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icnd2:spanning-tree [2024/04/23 09:11] 114.119.130.33 old revision restored (2023/10/15 15:12) |
icnd2:spanning-tree [2024/05/14 17:02] (current) 3.23.102.216 old revision restored (2024/04/28 06:17) |
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=====CONCEPT===== | =====CONCEPT===== | ||
- | * It does this with Each Switch broadcasting a **'' | + | * It does this with Each Switch broadcasting a **'' |
- | * Each SW will then determine 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/ |
- | * There can only be **one DESIGNATED port per SEGMENT/ | + | * Any port that is not DESIGNATED or a ROOT port, is then set to a BLOCKING state. |
- | * 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 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' | + | |
- | + | ||
- | =====Root Port Election===== | + | |
- | SW1 <> SW2 (Fa0/ | + | |
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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:** **'' | ||
- | * **100Mb link:** **'' | ||
- | * **1Gb Link:** **'' | ||
=====COMMANDS: | =====COMMANDS: |