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Example: Upgrading Junos OS in a Virtual Chassis Configuration for MX Series 5G Universal Routing Platforms by Rebooting the Routing Engines

You can upgrade an MX Series Virtual Chassis configuration from Junos OS Release 11.2 to a later release by rebooting each of the Routing Engines. Both member routers in the Virtual Chassis must have dual Routing Engines installed.

Note:

Make sure all four Routing Engines in the Virtual Chassis (both Routing Engines in the primary router and both Routing Engines in the backup router) are running the same Junos OS release.

This example describes how to upgrade Junos OS in a two-member MX Series Virtual Chassis by rebooting the Routing Engines. For information about upgrading Junos OS in an MX Series Virtual Chassis by performing a unified ISSU, see Upgrading Junos OS in an MX Series Virtual Chassis by Performing a Unified ISSU.

Requirements

This example uses the following software and hardware and components:

  • Junos OS Release 12.3 and later releases

  • One MX240 Universal Routing Platform with dual Routing Engines

  • One MX480 Universal Routing Platform with dual Routing Engines

Note:

This configuration example has been tested using the software release listed and is assumed to work on all later releases.

See Table 1 for information about the hardware installed in each MX Series router.

Best Practice:

We recommend that you use the commit synchronize command to save any configuration changes to the Virtual Chassis.

For an MX Series Virtual Chassis, the force option is the default and only behavior when you issue the commit synchronize command. Issuing the commit synchronize command for an MX Series Virtual Chassis configuration has the same effect as issuing the commit synchronize force command.

Overview and Topology

To upgrade Junos OS in an MX Series Virtual Chassis configuration by rebooting the Routing Engines, you must:

  1. Prepare for the upgrade.

  2. Install the Junos OS software package on each of the four Routing Engines.

  3. Re-enable graceful Routing Engine switchover and nonstop active routing.

  4. Reboot the Routing Engines to run the new Junos OS release.

Topology

This example upgrades Junos OS in an MX Series Virtual Chassis configuration that uses the basic topology shown in Figure 1. For redundancy, each member router is configured with two Virtual Chassis ports.

Figure 1: Sample Topology for a Virtual Chassis with Two MX Series RoutersSample Topology for a Virtual Chassis with Two MX Series Routers

Table 1 shows the hardware and software configuration settings for each MX Series router in the Virtual Chassis.

Table 1: Components of the Sample MX Series Virtual Chassis

Router Name

Hardware

Serial Number

Member ID

Role

Virtual Chassis Ports

Network Port Slot Numbering

gladius

MX240 router with:

  • 60-Gigabit Ethernet Enhanced Queuing MPC

  • 20-port Gigabit Ethernet MIC with SFP

  • 4-port 10-Gigabit Ethernet MIC with XFP

  • Primary RE-S-2000 Routing Engine in slot 0 (represented in example as member0-re0)

  • Backup RE-S-2000 Routing Engine in slot 1 (represented in example as member0-re1)

JN10C7135AFC

0

routing-engine (primary)

vcp-2/2/0vcp-2/3/0

FPC 0 – 11

trefoil

MX480 router with:

  • Two 30-Gigabit Ethernet Queuing MPCs

  • Two 20-port Gigabit Ethernet MICs with SFP

  • Two 2-port 10-Gigabit Ethernet MICs with XFP

  • Primary RE-S-2000 Routing Engine in slot 0 (represented in example as member1-re0)

  • Backup RE-S-2000 Routing Engine in slot 1 (represented in example as member1-re1)

JN115D117AFB

1

routing-engine (backup)

vcp-2/0/0vcp-5/2/0

FPC 12 – 23 (offset = 12)

Configuration

To upgrade Junos OS in a two-member MX Series Virtual Chassis by rebooting the Routing Engines, perform these tasks:

Preparing for the Upgrade

Step-by-Step Procedure

To prepare for the upgrade process:

  1. Use FTP or a Web browser to download the Junos OS software package to the primary Routing Engine on the Virtual Chassis primary router (VC-P).

    See Downloading Software.

  2. Disable nonstop active routing on the primary router.

  3. Disable graceful Routing Engine switchover on the primary router.

  4. Commit the configuration on the primary router.

  5. Exit CLI configuration mode.

Installing the Junos OS Software Package on Each Routing Engine

Step-by-Step Procedure

Installing the Junos OS software package on each Routing Engine in an MX Series Virtual Chassis prepares the Routing Engines to run the new software release after a reboot. This action is also referred to as arming the Routing Engines.

To install the Junos OS software package on all four Routing Engines from the primary router (member0-re0) in the Virtual Chassis:

  • Install the software package on VC-Pp.

    On a properly formed Virtual Chassis, this command propagates the image to all four Routing Engines.

Results

Display the results of the installation. Verify that the correct software package has been installed on the local primary Routing Engine in member 0 (member0-re0) and on the local primary Routing Engine in member 1 (member1-re0).

Re-enabling Graceful Routing Engine Switchover and Nonstop Active Routing

Step-by-Step Procedure

After upgrading the Junos OS release, you need to re-enable graceful Routing Engine switchover and nonstop active routing for the Virtual Chassis.

To re-enable graceful Routing Engine switchover and nonstop active routing from the Virtual Chassis primary router (member0-re0):

  1. In the console window on member 0 (gladius), enable graceful Routing Engine switchover on the primary router.

  2. Re-enable nonstop active routing on the primary router.

  3. Commit the configuration on the primary router.

Rebooting the Routing Engines to Run the New Junos OS Release

Step-by-Step Procedure

Note:

Rebooting both Routing Engines in the VC-P chassis may not result in a graceful switchover to the VC-B chassis, and is not recommended.

To reboot each of the four Routing Engines in an MX Series Virtual Chassis from the Virtual Chassis primary router (member0-re0):

  • Use the request system reboot command with no options.

    This command reboots all line cards in member 0 (gladius) and member 1 (trefoil) to use the new Junos OS release. A traffic disruption occurs until all line cards are back online and the Virtual Chassis re-forms.

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