C H A P T E R
21-1
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
21
Configuring Optional STP Features
This chapter describes how to configure optional STP features.
Note
•
For complete syntax and usage information for the commands used in this chapter, refer to the
Cisco
IOS Master Command List
, Release 12.2SX at this URL:
http://www.cisco.com/en/US/docs/ios/mcl/122sxmcl/12_2sx_mcl_book.html
•
For information on configuring the spanning tree protocol (STP), see
Chapter 20, “Configuring STP
and Prestandard IEEE 802.1s MST.”
This chapter consists of these sections:
•
Understanding How PortFast Works, page 21-2
•
Understanding How BPDU Guard Works, page 21-2
•
Understanding How PortFast BPDU Filtering Works, page 21-2
•
Understanding How UplinkFast Works, page 21-3
•
Understanding How BackboneFast Works, page 21-4
•
Understanding How EtherChannel Guard Works, page 21-6
•
Understanding How Root Guard Works, page 21-7
•
Understanding How Loop Guard Works, page 21-7
•
Enabling PortFast, page 21-8
•
Enabling PortFast BPDU Filtering, page 21-10
•
Enabling BPDU Guard, page 21-12
•
Enabling UplinkFast, page 21-12
•
Enabling BackboneFast, page 21-13
•
Enabling EtherChannel Guard, page 21-14
•
Enabling Root Guard, page 21-14
•
Enabling Loop Guard, page 21-15
