•
Example: Configuring Loop Protection to Prevent Interfaces from Transitioning from
Blocking to Forwarding in a Spanning Tree on EX Series Switches on page 1569
•
Example: Configuring Root Protection to Enforce Root Bridge Placement in Spanning
Trees on EX Series Switches on page 1573
•
Understanding BPDU Protection for STP, RSTP, and MSTP on EX Series Switches on
page 1522
Example: Configuring BPDU Protection on non-STP Interfaces to Prevent STP
Miscalculations on EX Series Switches
EX Series switches provide Layer 2 loop prevention through Spanning Tree Protocol
(STP), Rapid Spanning Tree protocol (RSTP), and Multiple Spanning Tree Protocol
(MSTP). Configure BPDU protection on non-STP interfaces that are connected to switches
with spanning trees to prevent the non-STP interfaces from receiving BPDUs. When
non-STP interfaces receive BPDUs, it can result in an STP misconfiguration, which could
lead to network outages.
This example describes how to configure BPDU protection on non-STP interfaces on an
EX Series switch:
•
Requirements on page 1565
•
Overview and Topology on page 1565
•
Configuration on page 1567
•
Verification on page 1567
Requirements
This example uses the following hardware and software components:
•
Junos OS Release 9.1 or later for EX Series switches
•
One EX Series switch in an RSTP topology
•
One EX Series switch that is not in a spanning-tree topology
Before you configure the interface for BPDU protection, be sure you have:
•
RSTP operating on Switch 1.
•
Disabled RSTP on Switch 2.
NOTE:
By default, RSTP is enabled on all EX Series switches.
Overview and Topology
A loop-free network is supported through the exchange of a special type of frame called
bridge protocol data unit (BPDU). Receipt of BPDUs on certain interfaces can lead to
1565
Copyright © 2010, Juniper Networks, Inc.
Chapter 65: Examples of Spanning-Tree Protocols Configuration
Summary of Contents for JUNOS OS 10.3 - SOFTWARE
Page 325: ...CHAPTER 17 Operational Mode Commands for System Setup 229 Copyright 2010 Juniper Networks Inc ...
Page 1323: ...CHAPTER 56 Operational Mode Commands for Interfaces 1227 Copyright 2010 Juniper Networks Inc ...
Page 2841: ...CHAPTER 86 Operational Commands for 802 1X 2745 Copyright 2010 Juniper Networks Inc ...
Page 3367: ...CHAPTER 113 Operational Mode Commands for CoS 3271 Copyright 2010 Juniper Networks Inc ...
Page 3435: ...CHAPTER 120 Operational Mode Commands for PoE 3339 Copyright 2010 Juniper Networks Inc ...
Page 3529: ...CHAPTER 126 Operational Mode Commands for MPLS 3433 Copyright 2010 Juniper Networks Inc ...