STP Protocol Operation 412
Topology Changes 413
Variants of STP 413
Multiple Spanning Tree Protocol Overview 414
MSTP Regions 414
MSTP Port Fast 415
MSTP Root Guard 415
MSTP Topology Change Guard 416
MSTP Supported Features 416
BPDU Guard 417
Flush Containment 417
Bringup Delay 417
Restrictions for configuring MSTP 418
Access Gateway 418
Overview of Access Gateway 419
Topology Change Propagation 421
Preempt Delay 422
Supported Access Gateway Protocols 422
MSTAG Edge Mode 422
PVSTAG on Bundle Interfaces 424
Per-VLAN Rapid Spanning Tree 424
Multiple VLAN Registration Protocol 425
How to Implement Multiple Spanning Tree Protocol 425
Configuring MSTP 426
Enabling MSTP 426
Configuring MSTP parameters 426
Verifying MSTP 431
Configuring MSTAG or REPAG 432
Configuring an untagged subinterface 432
Enabling MSTAG 432
Configuring MSTAG parameters 432
Configuring MSTAG Topology Change Propagation 438
Verifying MSTAG 438
MSTAG Uplink Tracking 439
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
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