Now that you have completed this
chapter, you should a have a firm understanding of the following
concepts:
- The Spanning-Tree algorithm and
protocol is a bridge-to-bridge link management protocol
providing path redundancy while preventing loops in the network.
- The Spanning-Tree algorithm
feature of Spanning-Tree Protocol performs topology
recalculations.
- The Spanning-Tree Protocol
communicates topology changes from switch to switch with BPDUs.
- BPDUs are not forwarded, but
receipt of a topology change BPDU may cause a switch to generate
and forward a topology change BPDU.
- When Spanning-Tree Protocol is
enabled, a port is always in one of the following states:
- Blocking
- Listening
- Learning
- Forwarding
- Disabled
- Spanning-Tree PortFast causes a
Spanning-Tree port to enter the forwarding state immediately,
bypassing the listening and learning states.
- You can use PortFast on switch
ports connected to a single workstation or server to allow those
devices to connect to the network immediately without waiting
for Spanning Tree to converge.
- UplinkFast provides fast
convergence after a Spanning-Tree topology change and achieves
load balancing between redundant links using uplink groups.
- BackboneFast is initiated when a
root port or blocked port on a switch receives inferior BPDUs
from its designated bridge.
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