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JNCIA-Junos lab 3 of 15

The commit model with rollback and rescue

Master the Junos commit model that makes Junos safe to change: compare before you commit, use commit confirmed as a safety net, roll back a bad change in seconds, save and load configuration files, and keep a rescue configuration for emergencies.

Run this lab

It needs Lite: its 1 node is set to 4 vCPU and 5,120 MB in total. That fits the free demo too.

In your workspace: Shared, then JNCIA-Junos JN0-106 guided labs, then 03 - The commit model with rollback and rescue

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Level
Beginner
Time
About 50 minutes
Nodes need
4 vCPU, 5,120 MB
Smallest plan
Lite

The scenario

The depot's cable has been patched into HQ's ge-0/0/2. Your change ticket says: bring the depot LAN up, keep a known-good copy of the configuration, and make sure the router can be recovered quickly if anything goes wrong. On Junos every one of those is a built-in feature of the commit model.

What you’ll practise

  • Explain the difference between the candidate and the active configuration
  • Use show | compare, commit check, commit comment and commit confirmed
  • List the commit history and roll back to an earlier configuration
  • Save the configuration to a file and load it back with override, merge and set
  • Save, view and restore a rescue configuration

The tasks

  1. Candidate versus active
  2. Commit with a safety net
  3. Keep a known-good file
  4. Make a mistake and roll back
  5. Load a change from the terminal
  6. Save a rescue configuration
  7. Working alongside colleagues (read only)

The Lab Tasks pane has the scenario, these tasks, the checks to run, hints and the full solution.

Topology and devices

The network as it opens in EVE-NG, drawn from the lab’s own canvas, and the image each node runs.

Topology of The commit model with rollback and rescue1 node and 3 networks, 3 links. Every link is listed as text below the diagram.HQOffice-LANWarehouse-LANDepot-LANge-0/0/1ge-0/0/0ge-0/0/2
1 node and 3 networks, with the interface names each link uses.
Every link, as text
  • HQ ge-0/0/0 to Office-LAN (network)
  • HQ ge-0/0/1 to Warehouse-LAN (network)
  • HQ ge-0/0/2 to Depot-LAN (network)
Nodes in The commit model with rollback and rescue, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
HQJuniper vJunos-routervjunosrouter-24.2R1-S2.54 vCPU, 5,120 MB

How to open this lab

  1. Sign in to your workspace at lab.cloudlabbox.com.

  2. In File Manager, open Shared, then the folder JNCIA-Junos JN0-106 guided labs.

  3. Open 03 - The commit model with rollback and rescue and start its nodes, then open Lab Tasks for the scenario and the steps.

The lab is read-only. You can start the nodes and configure the devices, but changes to the topology can’t be saved. To change it, rebuild it in your own folder.

More JNCIA-Junos labs

All JNCIA-Junos labs

CloudLabBox is independent of Juniper Networks. The lab follows exam topics and isn’t vendor training material; vendor names identify the exams and the images in the workspace.