CHAPTER
11-1
Cisco Systems IntelligentGigabit Ethernet Switch Modules for the IBM BladeCenter, Software Configuration Guide
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11
Configuring Optional Spanning-Tree FeaturesThis chapter describes how to configure optional spanning-tree features on yo ur Cisco Systems
Intelligent Gigabit Ethernet Switch Module. You can configure all of these features whe n your switch
is running the per-VLAN spanning-tree plus (PVST+). You can configure only the noted features when
your switch is running the Multiple Spanning Tree Protocol (MSTP) or the rapid per-VLAN
spanning-tree plus (rapid-PVST+) protocol.
For information on configuring the PVST+ and rapid PVST+, see Chapter 9, “Con figuring STP.” For
information about the Multiple Spanning Tree Protocol (MSTP) and how to map multiple VLANs to the
same spanning-tree instance, see Chapter 10, “Configuring MSTP.”
Note For complete syntax and usage information for the commands used in this chapter, see the command
reference for this release.
This chapter consists of these sections:
•Understanding Optional Spanning-Tree Features, page 11-1
•Configuring Optional Spanning-Tree Features, page 11-9
•Displaying the Spanning-Tree Status, page 11-17
Understanding Optional Spanning-Tree Features
These sections describe how the optional spanning-tree features work:
•Understanding Port Fast, page 11-2
•Understanding BPDU Guard, page 11-3
•Understanding BPDU Filtering, page 11-3
•Understanding UplinkFast, page 11-4
•Understanding BackboneFast, page 11-5
•Understanding EtherChannel Guard, page 11-8
•Understanding Root Guard, page 11-8
•Understanding Loop Guard, page 11-9