Cisco ONS 15454 - STP Features

CHAPTER
6-1
Cisco ONS 15454 SONET/SDH ML-Series Multilayer Ethernet Card Software Feature and Configuration Guide, R4.0
January 2004
6
Configuring STP and RSTP
This chapter describes the IEEE 802.1D Spanning Tree Protocol (STP) and the ML-Series
implementation of the IEEE 802.1W Rapid Spanning Tree Protocol (RSTP). It also explains how to
configure STP and RSTP on the ML-Series card.
This chapter consists of these sections:
• STP Features, page 6-1
• RSTP, page 6-9
• Interoperability with IEEE 802.1D STP, page 6-15
• Configuring STP and RSTP Features, page 6-15
• Verifying and Monitoring STP and RSTP Status, page 6-20
STP Features
These sections describe how the spanning-tree features work:
• STP Overview, page 6-2
• Supported STP Instances, page 6-2
• Bridge Protocol Data Units, page 6-2
• Election of the Root Switch, page 6-3
• Bridge ID, Switch Priority, and Extended System ID, page 6-4
• Spanning-Tree Timers, page 6-4
• Creating the Spanning-Tree Topology, page 6-4
• Spanning-Tree Interface States, page 6-5
• Spanning-Tree Address Management, page 6-8
• STP and IEEE 802.1Q Trunks, page 6-8
• Spanning Tree and Redundant Connectivity, page 6-8
• Accelerated Aging to Retain Connectivity, page 6-9