Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual page 1914

Complete Software Guide for Junos
Configuration
CLI Quick
Configuration
Step-by-Step
Procedure
Results
Verification
Purpose
Action
1810
®
OS for EX Series Ethernet Switches, Release 10.4
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
root protection for STP or MSTP topologies at the [
level.
To configure root protection on an interface:
To quickly configure root protection on interface
and paste it into the switch terminal window:
[edit]
set protocols rstp interface ge-0/0/7 no-root-port
To configure root protection:
Configure interface
1. ge-0/0/7
[edit protocols rstp]
user@switch#
set interface ge-0/0/7 no-root-port
Check the results of the configuration:
user@switch> show configuration protocols rstp
interface ge-0/0/7.0 {
no-root-port;
}
To confirm that the configuration is working properly:
Displaying the Interface State Before Root Protection Is Triggered on page 1810
Verifying That Root Protection Is Working on the Interface on page 1811
Displaying the Interface State Before Root Protection Is Triggered
Before root protection is triggered on interface
Use the operational mode command:
user@switch> show spanning-tree interface
Spanning tree interface parameters for instance 0
Interface Port ID
ge-0/0/0.0 128:513
ge-0/0/1.0 128:514
ge-0/0/2.0 128:515
ge-0/0/3.0 128:516
edit protocols
ge-0/0/7
:
ge-0/0/7
Designated Designated
port ID bridge ID
128:513 32768.0019e2503f00
128:514 32768.0019e2503f00
128:515 32768.0019e2503f00
128:516 32768.0019e2503f00
( | )] hierarchy
mstp stp
, copy the following command
, confirm the interface state.
Port State
Cost
20000 BLK
20000 BLK
20000 BLK
20000 FWD
Copyright © 2010, Juniper Networks, Inc.
Role
DIS
DIS
DIS
DESG