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Chapter 5
Using Spanning Tree with VLANs
Notice in the preceding switch output that BackboneFast is enabled for all
VLANs and it must be enabled on all switches in your network to function.
To verify that it is running on a switch, use the show spantree
backbonefast
command:
Todd5000> (enable) sh spantree backbonefast
Backbonefast is enabled.
Todd5000> (enable)
The above command shows that BackboneFast is enabled. That's all there is
to it.
Summary
T
his chapter covered the detailed Spanning Tree Protocol information
you need to be successful in the day-to-day maintenance of a layer 2 switched
internetwork. Specifically, we covered the following:
Cisco and the IEEE 802.1q committee
Scaling the STP protocol
Redundant links with STP
Parallel FastEthernet links
EtherChannel guidelines
Port Aggregation Protocol
PortFast
UplinkFast
BackboneFast
Key Terms
Before you take the exam, be sure you're familiar with the following terms:
Common Spanning Tree (CST)
Fast EtherChannel
Gigabit EtherChannel
Per-VLAN Spanning Tree (PVST)
Per-VLAN Spanning Tree+ (PVST+)
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