Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual page 113

Configuring Spanning Tree
This chapter describes the IEEE 802.1D bridge Spanning Tree Protocol (STP) and how to use and
configure Cisco's proprietary spanning tree protocols, Per VLAN Spanning Tree + (PVST+) and
Multi-Instance Spanning Tree Protocol (MISTP), on the Catalyst 6000 family switches.
Note For information on configuring the spanning tree PortFast, UplinkFast, and BackboneFast features,
see Chapter 9, "Configuring Spanning Tree PortFast, UplinkFast, BackboneFast, and Loop Guard."
This chapter consists of these sections:
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Note For complete syntax and usage information for the commands used in this chapter, refer to the
Catalyst 6000 Family Command Reference publication.
Understanding How Spanning Tree Protocols Work
This section describes the specific functions that are common to all spanning tree protocols. Cisco's
proprietary spanning tree protocols, PVST+ and MISTP, are based on IEEE 802.1D STP. (See the
"Understanding PVST+ and MISTP Modes" section on page 8-11
MISTP.) The 802.1D STP is a Layer 2 management protocol that provides path redundancy in a network
while preventing undesirable loops. All spanning tree protocols use an algorithm that calculates the best
loop-free path through the network.
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Understanding How Spanning Tree Protocols Work, page 8-1
Understanding PVST+ and MISTP Modes, page 8-11
Bridge Identifiers, page 8-13
Using PVST+, page 8-15
Using MISTP-PVST+ or MISTP, page 8-22
Configuring a Root Switch, page 8-31
Configuring Spanning Tree Timers, page 8-35
Understanding How BPDU Skewing Works, page 8-37
Configuring BPDU Skewing, page 8-38
Catalyst 6000 Family Software Configuration Guide-Releases 6.3 and 6.4
C H A P T E R
for information about PVST+ and
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8-1