Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual page 1909

Configuration
CLI Quick
Configuration
Step-by-Step
Procedure
Results
Verification
Purpose
Action
Copyright © 2010, Juniper Networks, Inc.
A spanning-tree topology contains ports that have specific roles:
The root port is responsible for forwarding data to the root bridge.
The alternate port is a standby port for the root port. When a root port goes down, the
alternate port becomes the active root port.
The designated port forwards data to the downstream network segment or device.
This configuration example uses an RSTP topology. However, you also can configure
loop protection for STP or MSTP topologies at the [
level.
To configure loop protection on an interface:
To quickly configure loop protection on interface
[edit]
set protocols rstp interface ge-0/0/6 bpdu-timeout-action block
To configure loop protection:
Configure interface
ge-0/0/6
1.
[edit protocols rstp]
user@switch# set interface ge-0/0/6 bpdu-timeout-action block
Check the results of the configuration:
user@switch> show configuration protocols rstp
interface ge-0/0/6.0 {
bpdu-timeout-action {
block;
}
}
To confirm that the configuration is working properly, perform these tasks:
Displaying the Interface State Before Loop Protection Is Triggered on page 1805
Verifying That Loop Protection Is Working on an Interface on page 1806
Displaying the Interface State Before Loop Protection Is Triggered
Before loop protection is triggered on interface
blocking.
Use the operational mode command:
user@switch> show spanning-tree interface
Spanning tree interface parameters for instance 0
Interface Port ID
Chapter 71: Examples of Spanning-Tree Protocols Configuration
edit protocols
ge-0/0/6
on Switch 3:
ge-0/0/6
Designated Designated
( mstp | stp )] hierarchy
:
, confirm that the interface is
Port State Role
1805