- Uplinkfast automatically transform the state of alternate port( blocked to forward )and become root port, with out completing listening & learning state(because patch is already calculated as loop free path).
- Work only when failure of directly connected link.
- After making alternative port to root port
- spoof the CAM table from the new root port
- Does not apply at Core layer, apply at distributed & access layer
- due to the increase in cost & priority
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