Specifications

•
All master Routing Engines in all routers run the same version of software. This is
necessary for the routing matrix to operate.
•
All master and backup Routing Engines run the same version of software before
beginning the upgrade procedure. Different versions of the Junos OS can have
incompatible message formats especially if you turn on GRES. Because the steps in
the process include changing mastership, running the same version of software is
recommended.
•
For a routing matrix with a TX Matrix router, the same Routing Engine model is used
within a TX Matrix router (SCC) and within a T640 router (LCC) of a routing matrix.
For example, a routing matrix with an SCC using two RE-A-2000s and an LCC using
two RE-1600s is supported. However, an SCC or an LCC with two different Routing
Engine models is not supported. We suggest that all Routing Engines be the same
model throughout all routers in the routing matrix. To determine the Routing Engine
type, use the CLI show chassis hardware | match routing command.
•
For a routing matrix with a TX Matrix Plus router, the SFC contains two model
RE-DUO-C2600-16G Routing Engines, and each LCC contains two model
RE-DUO-C1800-8G or RE-DUO-C1800-16G Routing Engines.
BEST PRACTICE: Make sure that all master Routing Engines are re0 and all
backup Routing Engines are re1 (or vice versa). For the purposes of this
document, the master Routing Engine is re0 and the backup Routing Engine
is re1.
To upgrade the software for a routing matrix, perform the following steps:
1. Disable graceful Routing Engine switchover (GRES) on the master Routing Engine
(re0) and save the configuration change to both Routing Engines.
2. Install the new Junos OS release on the backup Routing Engine (re1) while keeping
the currently running software version on the master Routing Engine (re0).
3. Load the new Junos OS on the backup Routing Engine. After making sure that the new
software version is running correctly on the backup Routing Engine (re1), switch
mastership back to the original master Routing Engine (re0) to activate the new
software.
4. Install the new software on the new backup Routing Engine (re0).
For the detailed procedure, see the Routing Matrix with a TX Matrix Router Deployment Guide
or the Routing Matrix with a TX Matrix Plus Router Deployment Guide.
Upgrading Using Unified ISSU
Unified in-service software upgrade (ISSU) enables you to upgrade between two different
Junos OS releases with no disruption on the control plane and with minimal disruption
of traffic. Unified in-service software upgrade is only supported by dual Routing Engine
platforms. In addition, graceful Routing Engine switchover (GRES) and nonstop active
routing (NSR) must be enabled. For additional information about using unified in-service
software upgrade, see the High Availability Feature Guide for Routing Devices.
Copyright © 2015, Juniper Networks, Inc.162
Release Notes: Junos OS Release 13.3R6 for the EX Series, M Series, MX Series, PTX Series, and T Series