Example: Configuring Network Regions For Vlans With Mstp - Juniper EX9200 Features Manual

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Example: Configuring Network Regions for VLANs with MSTP

Copyright © 2017, Juniper Networks, Inc.
Keep the following guidelines in mind when configuring spanning-tree instance interfaces
as edge ports:
Do not configure a spanning-tree instance interface as an edge port if it is connected
to any Layer 2 bridge. An instance interface connected to Layer 2 bridges but configured
as an edge port can cause physical loops.
if the spanning-tree protocol is configured to run the original IEEE 802.1D spanning-tree
version, the edge-port option (if configured) is ignored.
If edge ports are configured at both the VSTP global and VLAN levels, the configuration
at the VLAN level overrides the global configuration.
Example: Configuring BPDU Protection on Edge Interfaces to Prevent STP Miscalculations
Configuring Rapid Spanning Tree Protocol
Configuring Multiple Spanning Tree Protocol
Configuring VLAN Spanning Tree Protocol
edge on page 39
interface (Spanning Tree)
Configuring RSTP (CLI Procedure) on page 33
Configuring VLAN Spanning Tree Protocol on page 168
Configuring MSTP on page 108
NOTE: This example uses Junos OS for EX Series and QFX Series switches
with support for the Enhanced Layer 2 Software (ELS) configuration style.
If your switch runs software that does not support ELS, see Example:
Configuring Network Regions for VLANs with MSTP on EX Series Switches. For
ELS details, see Getting Started with Enhanced Layer 2 Software.
Multiple Spanning Tree Protocol (MSTP) is used to create a loop-free topology in networks
using multiple spanning-tree regions in which each region contains multiple spanning-tree
instances (MSTIs). MSTIs provide different paths for different VLANs. This functionality
facilitates better load sharing across redundant links.
Up to 64 MSTIs 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 82
Overview and Topology on page 82
Configuring MSTP on Switch 1 on page 85
Chapter 4: Using MSTP
81