CHAPTER 8
Implementing Multiple Spanning Tree Protocol
This module provides conceptual and configuration information for Multiple Spanning Tree Protocol on Cisco
ASR 9000 Series Routers. Multiple Spanning Tree Protocol (MSTP) is a spanning-tree protocol used to prevent
loops in bridge configurations. Unlike other types of STPs, MSTP can block ports selectively by VLAN.
ModificationRelease
This feature was introduced on Cisco ASR 9000 Series
Routers
Release 3.7.3
Support for MSTP over Bundles feature was added.Release 3.9.1
Support for PVST+ and PVSTAG features was added.Release 4.0.1
Support for MSTAG Edge Mode feature was added.Release 4.1.0
Support for PVSTAG was added on Bundle interfaces.Release 4.3.0
Support for PVRST was added.Release 5.1.0
• Prerequisites for Implementing Multiple Spanning Tree Protocol, on page 411
• Information About Implementing Multiple Spanning Tree Protocol, on page 412
• How to Implement Multiple Spanning Tree Protocol, on page 425
• Configuration Examples for Implementing MSTP, on page 451
PrerequisitesforImplementingMultipleSpanningTreeProtocol
This prerequisite applies to implementing MSTP:
You must be in a user group associated with a task group that includes the proper task IDs. The command
reference guides include the task IDs required for each command.
If you suspect user group assignment is preventing you from using a command, contact your AAA administrator
for assistance.
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
411
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