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[EX] Procedure for upgrading Virtual Chassis

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Article ID: KB23122 KB Last Updated: 14 Aug 2020Version: 4.0
Summary:

This KB article provides information about the procedures to upgrade an existing EX8200 Virtual Chassis (VC).

The methods are:

  • Standard procedure which requires downtime for the entire EX-8200 VC.
  • NSSU (Nonstop Software Upgrade).
Solution:

Standard Procedure which requires downtime for entire EX8200-VC

To upgrade the entire EX8200-VC from the XRE Master device, perform the following procedure:
  1. Look for the Junos image to download, for the release you wish to upgrade, at the following link:

    http://www.juniper.net/support/downloads/junos.html

    Note: The size of the XRE package is 300+ MB. It contains the software image for the XRE-200, as well as the EX8200's. The purpose of this large package is to ensure that with one package, you will be able to upgrade the entire EX8200-VC with a single reboot. This includes both XRE's and EX8200 Master and Backup Routing Engines.

  2. Upload the package to the /var/tmp/ directory on the Master XRE-200 device.

  3. Add the package on the master by using the following command:

    root> request system software add /var/tmp/jinstall-ex-xre200-11.4R1.6-domestic-signed.tgz

    Checking pending install on member9
    Checking pending install on member0-re0
    Checking pending install on member0-re1
    Checking pending install on member1-re0
    Checking pending install on member1-re1
    Checking pending install on member8

    Pushing bundle to member9
    Pushing bundle to member0-re0
    Pushing bundle to member0-re1
    Pushing bundle to member1-re0
    Pushing bundle to member1-re1

    Validating on member9
    Validating on member0-re0
    Validating on member0-re1
    Validating on member1-re0
    Validating on member1-re1
    Validating on member8

    Done with validate on all virtual chassis members

    member9:
    WARNING: A reboot is required to install the software
    WARNING: Use the 'request system reboot' command immediately

    member0-re0:
    WARNING: A reboot is required to install the software
    WARNING: Use the 'request system reboot' command immediately

    member0-re1:
    WARNING: A reboot is required to install the software
    WARNING: Use the 'request system reboot' command immediately

    member1-re0:
    WARNING: A reboot is required to install the software
    WARNING: Use the 'request system reboot' command immediately

    member1-re1:
    WARNING: A reboot is required to install the software
    WARNING: Use the 'request system reboot' command immediately

    member8:
    WARNING: A reboot is required to install the software
    WARNING: Use the 'request system reboot' command immediately

  4. Reboot the entire EX-8200 VC by using the following command:
    Juniper@root> run request system reboot all-members
    After the reboot, all of the EX8200-VC's will come up with the new Junos Software installed.

NSSU (Nonstop Software Upgrade)

You can also upgrade the software on an EX8200 Virtual Chassis, by using the Nonstop Software Upgrade (NSSU) method. Unlike a standard software upgrade, NSSU does not require a reboot of the Virtual Chassis. Instead, it takes advantage of graceful Routing Engine switchover and nonstop active routing (NSR), to ensure that no disruption to the control plane occurs during the upgrade.

You can minimize disruption to the network traffic by defining link aggregation groups (LAGs), in such a way that the member links of each LAG reside on different line cards. The line cards are upgraded one at a time, so that the traffic continues to flow through the other line cards when a line card is being upgraded.

For more information, refer to the following links:
Modification History:
2020-08-14: Article reviewed for accuracy; no changes required.
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