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Layer 2 Services — Spanning-Tree Protocols

Junos OS Layer 2 Configuration Guide

Overview
Configuration
Administration
Troubleshooting

Spanning-Tree Protocols

Spanning-Tree Protocols Supported on MX Series Routers

BPDU Overview

Overview
Spanning-Tree Protocols
Spanning-Tree Protocols Supported on MX Series Routers
BPDU Overview

Spanning-Tree Protocols
Spanning-Tree Protocols Supported on MX Series Routers BPDU Overview

Configuration Guidelines for Spanning-Tree Protocols
Spanning-Tree Protocols in Logical Systems RSTP or VSTP Forced to Run as IEEE 802.1D STP Reverting RSTP or VSTP Back From Forced IEEE 802.1D STP Provider Bridge Participation in RSTP or MSTP Instances System Identifier for Bridges in STP or RSTP Instances Bridge Priority for Election of Root Bridge and Designated Bridge Maximum Age for Awaiting Arrival of Hello BPDUs Hello Time for Root Bridge to Transmit Hello BPDUs Forward Delay Before Ports Transition to Forwarding State Spanning-Tree Instance Interface Spanning-Tree Instance Interface Priority Spanning-Tree Instance Interface Cost Spanning-Tree Instance Interface Point-to-Point Link Mode Spanning-Tree Instance Interface Configured as an Edge Port Spanning-Tree Protocol Trace Options

Configuration Guidelines for Spanning-Tree Protocols

Spanning-Tree Protocols in Logical Systems

RSTP or VSTP Forced to Run as IEEE 802.1D STP

Reverting RSTP or VSTP Back From Forced IEEE 802.1D STP

Provider Bridge Participation in RSTP or MSTP Instances

System Identifier for Bridges in STP or RSTP Instances

Bridge Priority for Election of Root Bridge and Designated Bridge

Maximum Age for Awaiting Arrival of Hello BPDUs

Hello Time for Root Bridge to Transmit Hello BPDUs

Forward Delay Before Ports Transition to Forwarding State

Spanning-Tree Instance Interface

Spanning-Tree Instance Interface Priority

Spanning-Tree Instance Interface Cost

Spanning-Tree Instance Interface Point-to-Point Link Mode

Spanning-Tree Instance Interface Configured as an Edge Port

Spanning-Tree Protocol Trace Options

Configuration Tasks for Spanning-Tree Protocols
Configuring RSTP Configuring MSTP Configuring MST Instances on a Physical Interface Disabling MSTP Configuring VSTP Tracing Spanning-Tree Operations

Configuration Tasks for Spanning-Tree Protocols

Configuring RSTP

Configuring MSTP

Configuring MST Instances on a Physical Interface

Disabling MSTP

Configuring VSTP

Tracing Spanning-Tree Operations

Spanning-Tree Protocol Examples
Blocking BPDUs on Aggregated Ethernet Tracing Spanning-Tree Protocol Operations Example: Configuring VSTP on a Trunk Port with Tagged Traffic

Spanning-Tree Protocol Examples

Blocking BPDUs on Aggregated Ethernet

Tracing Spanning-Tree Protocol Operations

Example: Configuring VSTP on a Trunk Port with Tagged Traffic

Configuration Statements for Spanning-Tree Protocols
[edit protocols mstp] Hierarchy Level [edit protocols rstp] Hierarchy Level [edit protocols vstp] Hierarchy Level • protocols • access-trunk • bpdu-destination-mac-address (Spanning Tree) • bridge-priority • configuration-name • cost • disable • edge • extended-system-id • force-version • forward-delay • hello-time • interface (Spanning Tree) • max-age • max-hops • mode • msti • mstp • priority • revision-level • rstp • traceoptions • vlan (MSTP) • vlan (VSTP) • vstp [edit protocols layer2-control] Hierarchy Level • interface (Layer 2 Protocol Tunneling) • layer2-control • mac-rewrite • protocol

Configuration Statements for Spanning-Tree Protocols

[edit protocols mstp] Hierarchy Level

[edit protocols rstp] Hierarchy Level

[edit protocols vstp] Hierarchy Level

• protocols

• access-trunk

• bpdu-destination-mac-address (Spanning Tree)

• bridge-priority

• configuration-name

• cost

• disable

• edge

• extended-system-id

• force-version

• forward-delay

• hello-time

• interface (Spanning Tree)

• max-age

• max-hops

• mode

• msti

• mstp

• priority

• revision-level

• rstp

• traceoptions

• vlan (MSTP)

• vlan (VSTP)

• vstp

[edit protocols layer2-control] Hierarchy Level

• interface (Layer 2 Protocol Tunneling)

• layer2-control

• mac-rewrite

• protocol

Managing Spanning-Tree Protocol Mode
Reverting RSTP or VSTP Back From Forced IEEE 802.1D STP

Managing Spanning-Tree Instance Interface Status
Checking the Status of Spanning-Tree Instance Interfaces Clearing the Blocked Status of a Spanning-Tree Instance Interface Checking for a MAC Rewrite Error Condition Blocking a Spanning-Tree Instance Interface Clearing a MAC Rewrite Error Condition Blocking a Spanning-Tree Instance Interface

Managing Spanning-Tree Instance Interface Status

Checking the Status of Spanning-Tree Instance Interfaces

Clearing the Blocked Status of a Spanning-Tree Instance Interface

Checking for a MAC Rewrite Error Condition Blocking a Spanning-Tree Instance Interface

Clearing a MAC Rewrite Error Condition Blocking a Spanning-Tree Instance Interface