•
Configuration on page 1346
•
Verification on page 1346
Requirements
This example uses the following hardware and software components:
•
Two EX4200 distribution switches.
•
One EX3200 access switch.
•
Junos OS Release 9.0 or later for EX Series switches
Before you configure the redundant trunk links network on the access and distribution
switches, be sure you have:
•
Installed the access switch. See Installing and Connecting an EX3200 or EX4200
Switch.
•
Installed the two distribution switches. See Installing and Connecting an EX3200 or
EX4200 Switch.
•
Performed the initial switch configuration. See “Connecting and Configuring an EX
Series Switch (J-Web Procedure)” on page 189.
Overview and Topology
This example shows a simple configuration to illustrate the basic steps for creating a
redundant trunk group.
Configuring redundant trunk links places the primary link and the secondary link in a
redundant group. However, a primary link need not be configured. If a primary link is not
specified, the software compares the two links and selects the link with the highest port
number as the active link. For example, if the two interfaces are
ge-0/1/0
and
ge-0/1/1
,
the software assigns
ge-0/1/1
as the active link..
Whether a primary link is specified as the active link, or whether it is calculated by the
software, traffic is handled in the same manner. Traffic passes through the active link
but is blocked on the secondary link. If the active link goes down or is disabled
administratively, the secondary link becomes active and begins forwarding traffic.
However, there is a difference between the behavior of a primary, active link and an active
link that is calculated to be active by the software. If an active link goes down, the
secondary link begins forwarding traffic. If the old, active link comes up again, the following
occurs:
•
If the old, active link was configured as the primary link, then it resumes the role of
active link and the other link is blocked. An interface configured as primary continues
to carry with it the primary role whenever it becomes active.
•
If no primary link was configured, and the active link was calculated by the software
when the redundant group was formed, then the old, active link will not preempt the
other interface (new active).
Copyright © 2010, Juniper Networks, Inc.
1344
Complete Software Guide for Junos
®
OS for EX Series Ethernet Switches, Release 10.3
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 ...