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# Upgrading Router Software with Unified ISSU

To upgrade your router software by means of unified ISSU, perform the following steps.

1. Disable autosynchronization.
   `
   host1(config)#disable-autosync
   `
2. Copy the new release to the router.

   | Note: Be sure to specify the correct software release (.rel) filename for the router you are using, as described in the section Identifying the Software Release File in the JUNOSe System Basics Configuration Guide.

   `
   host1#copy /incoming/releases/ftpserver/quebec2.rel R2.rel
   `
3. Save the current configuration.
   `
   host1#copy running-configuration system2.cnf
   `
4. Determine whether the router hardware and the software release meet the criteria required for unified ISSU to operate successfully by using one of the following commands:
   `
   host1#show issu
   host1#show issu brief
   host1#show issu detail
   `
5. Arm the primary SRP module with the upgrade release.
   `
   host1#boot system R2.rel
   `

   | Note: You must arm any hotfixes that need to be loaded with the new release after you have armed the new release. The hotfixes are supplied when the modules to which they apply are rebooted.

6. Synchronize the NVS file system of the redundant SRP module with that of the primary SRP module.
   `
   host1#synchronize
   `

   Because the redundant SRP module is running a different release than the armed release, the module automatically reboots and runs the armed (upgrade) release, R2.rel.

   Wait for the redundant SRP module to boot, initialize, and reach the standby state. At this point, the REDUNDANT LED on the module is illuminated and the ONLINE LED is off. The State field in the show version display indicates that the redundant module is in the standby state.

7. Synchronize the file system of the primary module with that of the redundant module.

   The NVS file systems of the two SRP modules are unsynchronized because the redundant SRP module rebooted.

   `
   host1#synchronize
   `
8. Reenable autosynchronization.
   `
   host1(config)#no disable-autosync
   `
9. (ERX1440 only) Configure the ERX1440 license key.
   `
   host(config)#license issu xyz123abc
   License for ISSU configured.
   `
10. Determine whether unified ISSU is in the Idle state and whether all upgrade requirements have been met.
    `
    host1#show issu
    `

    | Note: If the results indicate that some requirements are not met, you must correct this situation before proceeding.

11. Ensure that stateful SRP switchover is configured on the router.
    `
    host1#show redundancy srp
    `

    If it is not already configured, do so now.

    `
    host1(config)#redundancy
    host1(config-redundancy)#mode high-availability
    `
12. For each configured protocol on the router and its neighbors, ensure that graceful restart is configured. See the relevant protocol configuration chapters in the JUNOSe document set for information about configuring graceful restart.
13. Begin the initialization phase of the unified in-service software upgrade.
    `
    host1#issu initialize
    `

    The CLI displays the status of the initialization as it proceeds.

14. (Optional) From a different CLI session, display the progress of the initialization.
    `
    host1#show issu
    `

    Unified ISSU must be in the Initialized state before you proceed to the next step. The time required for initialization varies with the system load and the complexity of the router configuration.

15. Start the upgrade phase.
    `
    host1#issu start
    `

    The router switches to the redundant SRP module running the upgrade release, R2.rel. Significant upgrade milestones are displayed as they occur.

16. When the console indicates that the upgrade is completed, you can verify that the router is back in the idle state and running the upgrade release, R2.rel.
    `
    host1#show issu
    `

    You can also verify the status of the SRP modules and line modules, as well as the running and armed releases.

    `
    host1#show version
    `

issu initialize

- Use to start the initialization phase of the unified ISSU process.
- This command displays the percentage completion for the process as it takes place.
- Example
  `
  host1#issu initialize
  Verifying the ISSU criteria… verified
  Starting the ISSU initializing phase
  Upgrading the standby SRP- This phase can take a long time
  10% completed…
  `
- There is no no version.
- See issu initialize.

issu start

- Use to start the upgrade phase of the unified ISSU process after the initialization phase has completed.
- Example
  `
  host1#issu start
  Verifying the ISSU criteria… verified
  The system will now enter the upgrading phase. This phase cannot be aborted.
  Do you wish to continue?
  Yes
  Starting the ISSU upgrade phase
  … Upgrading the line card – Control plane
  … Upgrading completed
  Switching from primary SRP to the standby SRP
  The system will resume on the SRP in slot 7 in a few minutes.
  `
- There is no no version.
- See issu start.

issu stop

- Use to gracefully stop a unified in-service software upgrade and place the process in an idle state.
- You can issue this command only when unified ISSU is in the initialized state. You cannot issue this command after you have issued the issu start command to begin the upgrade phase of unified ISSU.
- Example
  `
  host1#issu stop
  The command will abort the ISSU operation. Do you wish to continue?
  Yes
  Stopping the ISSU upgrade process
  ...reloading standby SRP
  `
- There is no no version.
- See issu stop.

license issu

- Use to specify the unified ISSU license key for an ERX1440 router.
- Purchase a unified ISSU license to allow a unified ISSU upgrade on an E Series router.

  | Note: Acquire the ERX1440 unified ISSU license from Juniper Networks Customer Service or your Juniper Networks sales representative.

- The issu initialization, issu start, issu stop, and show issu commands are not visible on an ERX1440 router until you specify the license.
- This command is not visible on an E120 or E320 router. A license is not required or available for the E120 and E320 routers.
- Example 1—the correct key is entered
  `
  host1#license issu xyz123abc
  License for ISSU configured.
  `
- Example 2—an incorrect key is entered
  `
  host1#license issu abc123def456
  %Unable to configure ISSU license (Invalid License)
  `
- Use the no version to disable the license on the ERX1440 router.
- See license issu

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