STP 802.1D
Portfast
- Ports coming up are put into forwarding states
- TCN are not generated when a port comes up or down
Uplinkfast
- detects a directly connected failure and enables a new root port immediately
- increases the root priority to ensure that the switch will not become the root
- sets the port cost to 3000
- tracks alternate root ports
Backbonefast
- speeds convergence when a failure occurs and is indeireclty located. Reduces convergence from 50 seconds to approx 30 seconds.
- all switches need to bne configured with backbonefast
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