In-Service Software Upgrade Process
When you request an ISSU on a standalone device:
1. The management process (mgd) verifies that non-stop routing (NSR), graceful Routing
Engine switchover (GRES), and non-stop bridging (NSB) are enabled.
2. The router downloads and validates the software package.
3. The ISSU state machine spawns the backup Routing Engine (RE) with the newer
software.
4. The ISSU state machine checks to see if the backup RE has synchronized all of the
data with the master RE.
5. The ISSU state machine moves the devices (for example, forwarding ASIC, FPGA,
management port and serial console) from the master RE to the backup RE.
6. The mastership is switched between the REs, so the backup RE becomes the master
RE.
7. The old master RE is shut down.
Related
Documentation
Performing an In-Service Software Upgrade (ISSU) in ACX5000 Series Routers
You can use an in-service software upgrade to upgrade the software running on the router
with minimal traffic disruption during the upgrade.
NOTE: ISSU is supported in Junos OS Release 15.1X54–D60 and later on
ACX5000 Series routers.
This topic covers:
1.
Preparing the Router for Software Installation on page 69
2.
Upgrading the Software Using ISSU on page 71
3.
Verifying a Unified ISSU on page 73
Preparing the Router for Software Installation
Before you begin software installation using ISSU:
NOTE: Before you perform an in-service software upgrade, if applicable,
remove the set system internet-options no-tcp-reset drop-all-tcp command
from the configuration, otherwise the upgrade will fail and an error message
will be displayed.
69Copyright © 2017, Juniper Networks, Inc.
Chapter 2: Installing and Upgrading Junos OS
To Next Page
Loading...
Need help?
General
