JunosOS

🧯 The Most Underrated Junos OS Command: rollback 1

One command. Instant relief. Learn how rollback 1 in Junos OS can save your config—and your nerves—when things go sideways.

21 Apr 2025 • 1 min read

"Wait… what did I just do?"

We’ve all seen it. An engineer hits commit, and the router flips into chaos:

But here’s the thing—Junos has your back.

Instead of hunting down changes or frantically retyping configs, just do this:

configure
rollback 1
commit

💥 BOOM. You’re instantly back to the last known-good state. Zero panic. Zero guesswork.

🛠️ Want to See What Changed First?

You can preview the differences before committing to a rollback:

show | compare rollback 1

This will show a clear diff between your current candidate config and the previous commit.

Don’t wait for something to go wrong. Save a "known-good" config at any time using:

request system configuration rescue save

Then later, if needed:

rollback rescue
commit

Perfect for post-deployment baselines or pre-maintenance snapshots.

No problem. Just cancel the changes and start fresh:

rollback 0

This throws away your uncommitted changes and resets the candidate config.

I’ve seen engineers panic and freeze over a simple typo—when all they needed was:

This command should be in everyone’s mental toolkit, especially during high-pressure troubleshooting or maintenance windows.

☮️ Be the calm voice during the next outage.
🧑‍🏫 Teach someone this command.
🧠 And don’t forget to commit it to memory.

🧠 For more bite-sized insights and real-world labs, follow my blog: 📬 Bryan’s Backbone → https://blog.brysteele.com
🌐 Or explore → https://brysteele.com

Until next time, stay sharp—stay ready.

☮️ out.

-Bryan