Configuring Multiple Spanning Tree; Information About Mst; Mst Overview - Cisco AP775A - Nexus Converged Network Switch 5010 Configuration Manual

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Configuring Multiple Spanning Tree

Multiple Spanning Tree (MST), which is the IEEE 802.1s standard, allows you to assign two or more VLANs

to a spanning tree instance. MST is not the default spanning tree mode; Rapid per VLAN Spanning Tree

(Rapid PVST+) is the default mode. MST instances with the same name, revision number, and

VLAN-to-instance mapping combine to form an MST region. The MST region appears as a single bridge

to spanning tree configurations outside the region. MST fails over to IEEE 802.1D Spanning Tree Protocol

(STP) when it receives an 802.1D message from a neighboring switch.

Spanning tree is used to refer to IEEE 802.1w and IEEE 802.1s. If the text is discussing the IEEE 802.1D

Spanning Tree Protocol, 802.1D is stated specifically.

This chapter describes how to configure MST on Cisco Nexus 5000 Series switches. It contains the following

You must enable MST; Rapid PVST+ is the default spanning tree mode.

MST maps multiple VLANs into a spanning tree instance, with each instance having a spanning tree topology

independent of other spanning tree instances. This architecture provides multiple forwarding paths for data

traffic, enables load balancing, and reduces the number of STP instances required to support a large number

of VLANs. MST improves the fault tolerance of the network because a failure in one instance (forwarding

path) does not affect other instances (forwarding paths).

Information About MST, page 175

Configuring MST, page 183

Verifying MST Configurations, page 197

C H A P T E R

Cisco Nexus 5000 Series Switch CLI Software Configuration Guide

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