This blog was originally started to better help me understand the technologies in the CCIE R&S blueprint; after completing the R&S track I have decided to transition the blog into a technology blog.

CCIE #29033

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Saturday, February 5, 2011

Quick Notes - STP

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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