Technical Documentation

Technical Documentation

Layer 2 Services on MX Series Routers — Spanning-Tree Protocols

Juniper Networks MX Series Ethernet Services Routers are Ethernet-optimized edge routers that you can configure to support Layer 2 switching and bridging functions as well as Layer 3 routing. This page contains the latest information about Layer 2 services on MX Series routers. For the latest information about MX Series router hardware, see the MX Series Ethernet Services Routers page.

OverviewConfigurationAdministrationTroubleshooting
Configuration Guidelines for Spanning-Tree Protocols

Spanning-Tree Protocols in Logical Systems

RSTP or VSTP Forced to Run as IEEE 802.1D STP

RSTP or VSTP Reverted Back From 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

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 Guidelines for Spanning-Tree Protocol Options

Loop Protection for a Spanning-Tree Instance Interface

Root Protect for a Spanning-Tree Instance Interface

BPDU Protection for Individual Spanning-Tree Instance Interfaces

BPDU Protection on All Edge Ports of the Bridge

VPLS Multihoming: Priority of the Backup Bridge

VPLS Multihoming: Hold Time Before Switching to Primary Priority

VPLS Multihoming: System Identifier for Bridges in the Ring

VPLS Multihoming: Bridge Flush of MAC Cache

Configuration Tasks for Spanning-Tree Protocol Options

Loop Protection for a Spanning-Tree Instance Interface

Enabling Root Protect for a Spanning-Tree Instance Interface

BPDU Protection for Individual Ports

BPDU Protection on All Edge Ports

Topology Change Actions for Global Spanning Tree Behavior

Topology Change Actions for VLAN Spanning Tree Behavior

Configuration Guidelines for Layer 2 Protocol Tunneling

MAC Address Rewriting Enabled for Layer 2 Protocol Tunneling

Layer 2 Protocol Tunnel Interface

Layer 2 Protocol to be Tunneled

Configuration Tasks for Layer 2 Protocol Tunneling

Configuring Layer 2 Protocol Tunneling

Checking and Clearing BPDU Error Conditions

Spanning-Tree Protocol Examples

Enabling Loop Protection

Blocking BPDUs on Aggregated Ethernet

Configuring VPLS Root Topology Change Actions

Tracing Spanning-Tree Protocol Operations

Configuration Statements for Spanning-Tree Protocols

[edit protocols mstp] Hierarchy Level

[edit protocols rstp] Hierarchy Level

[edit protocols vstp] Hierarchy Level

 •  protocols

 •  backup-bridge-priority

 •  bpdu-block-on-edge

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

 •  bpdu-timeout-action

 •  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

 •  no-root-port

 •  priority

 •  priority-hold-time

 •  revision-level

 •  rstp

 •  system-id

 •  traceoptions

 •  vlan (MSTP)

 •  vlan (VSTP)

 •  vpls-flush-on-topology-change

 •  vstp

[edit protocols layer2-control] Hierarchy Level

 •  bpdu-block

 •  disable-timeout

 •  interface (BPDU Blocking)

 •  interface (Layer 2 Protocol Tunneling)

 •  layer2-control

 •  mac-rewrite

 •  protocol