Chapter 9 Configuring Stp Extensions; Information About Stp Extensions; Overview; Understanding Stp Port Types - Cisco Nexus 3000 Series Configuration Manual

Configuring STP Extensions
This chapter contains the following sections:
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Information About STP Extensions

Overview

Cisco has added extensions to Spanning Tree Protocol (STP) that make convergence more efficient. In some
cases, even though similar functionality may be incorporated into the IEEE 802.1w Rapid Spanning Tree
Protocol (RSTP) standard, we recommend using these extensions. All of these extensions can be used with
both RPVST+ and Multiple Spanning Tree Protocol (MST).
The available extensions are spanning tree port types, Bridge Assurance, BPDU Guard, BPDU Filtering, Loop
Guard, and Root Guard. Many of these features can be applied either globally or on specified interfaces.
Spanning tree is used to refer to IEEE 802.1w and IEEE 802.1s. If the text is discussing the IEEE 802.1D
Note
Spanning Tree Protocol, 802.1D is stated specifically.

Understanding STP Port Types

You can configure a spanning tree port as an edge port, a network port, or a normal port. A port can be in
only one of these states at a given time. The default spanning tree port type is normal. Depending on the type
of device to which the interface is connected, you can configure a spanning tree port as one of these port types.
OL-29545-03
Information About STP Extensions, page 103
Configuring STP Extensions, page 107
Verifying the STP Extension Configuration, page 116
Troubleshooting Loop Detection Error Message, page 116
Generating Syslog Error Messages, page 117
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