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Example: Configuring BPDU Protection on 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 interfaces to prevent them from receiving BPDUs
that could result in STP misconfigurations, which could lead to network outages.
This example describes how to configure BPDU protection on access interfaces on an
EX Series switch in an RSTP topology:
•
Requirements on page 1561
•
Overview and Topology on page 1561
•
Configuration on page 1562
•
Verification on page 1563
Requirements
This example uses the following hardware and software components:
•
Junos OS Release 9.1 or later for EX Series switches
•
Two EX Series switches in an RSTP topology
Before you configure the interfaces on Switch 2 for BPDU protection, be sure you have:
•
RSTP operating on the switches.
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 in an STP,
RSTP, or MSTP topology, however, can lead to network outages by triggering an STP
misconfiguration. To prevent such outages, enable BPDU protection on those interfaces
that should not receive BPDUs.
Enable BPDU protection on switch interfaces connected to user devices or on interfaces
on which no BPDUs are expected, such as edge ports. If a BPDU is received on a
BPDU-protected interface, the interface is disabled and stops forwarding frames.
Two EX Series switches are displayed in Figure 37 on page 1562. In this example, Switch 1
and Switch 2 are configured for RSTP and create a loop-free topology. The interfaces
on Switch 2 are access ports.
1561
Copyright © 2010, Juniper Networks, Inc.
Chapter 65: Examples of Spanning-Tree Protocols Configuration
Содержание JUNOS OS 10.3 - SOFTWARE
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Страница 3929: ...CHAPTER 135 Operational Mode Commands for General Network Management and Monitoring 3833 Copyright 2010 Juniper Networks Inc ...
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