Example: Configuring Network Regions for VLANs with MSTP on EX Series Switches
Multiple Spanning Tree Protocol (MSTP) is used to create a loop-free topology in networks
using multiple spanning tree regions, each region containing multiple spanning-tree
instances (MSTIs). MSTIs provide different paths for different VLANs. This functionality
facilitates better load sharing across redundant links.
Up to 64 MSTI instances can be created for an EX Series switch, and each MSTI can
support up to 4094 VLANs.
This example describes how to configure MSTP on four EX Series switches:
•
Requirements on page 1541
•
Overview and Topology on page 1541
•
Configuring MSTP on Switch 1 on page 1544
•
Configuring MSTP on Switch 2 on page 1547
•
Configuring MSTP on Switch 3 on page 1549
•
Configuring MSTP on Switch 4 on page 1552
•
Verification on page 1555
Requirements
This example uses the following hardware and software components:
•
Junos OS Release 9.0 or later for EX Series switches
•
Four EX Series switches
Before you configure the switches for MSTP, be sure you have:
•
Installed the four switches. See “Connecting and Configuring an EX Series Switch
(J-Web Procedure)” on page 189.
•
Performed the initial software configuration on all switches. See Installing and
Connecting an EX3200 or EX4200 Switch.
Overview and Topology
When the number of VLANs grows in a network, MSTP provides a more efficient way of
creating a loop-free topology using MSTIs. Each MSTI in the spanning tree domain
maintains its own tree. Each tree can be mapped to different links, utilizing bandwidth
that would be unavailable to a single tree. MSTIs reduce demand on system resources.
1541
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 ...