After You Upgrade Junos operating system (Junos OS)

To verify that the new version of Junos OS is running as expected after the upgrade, follow these steps:

Compare Information Logged Before and After the Upgrade

Purpose

Compare the operation of the system before and after the upgrade to ensure that everything is working as expected.

Action

To obtain system information, use the following Junos OS CLI operational mode commands:

user@host> show versionuser@host> show chassis hardwareuser@host> show configuration user@host> show interface terse user@host> show bgp summary user@host> show isis adjacency brief user@host> show ospf neighbor brief user@host> show system storage

Compare the information from these commands with the information you logged before the upgrade.

Back Up the New Software

Purpose

After a week or so, when you are satisfied that the new software is running successfully, we recommend that you back up the upgraded software.

Action

To back up the upgraded software, use the following Junos OS CLI operational mode command:

user@host> request system snapshot

The root file system is backed up to /altroot, and/config is backed up to /altconfig. The root and /config file systems are on the router’s internal flash drive, and the /altroot and /altconfig file systems are on the router’s hard drive.

Note: After you issue the request system snapshot command, you cannot return to the previous version of the software because the running and backup copies of the software are identical.