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CCNP ENCOR lab 30 of 36

Embedded Event Manager applets

Teach Bristol's router to look after itself with EEM: bring a backup link up and down from a tracked probe, collect evidence the moment the WAN fails, take health snapshots on demand and on a timer, and block accidental reloads.

Run this lab

It needs Lite: its 3 nodes are set to 3 vCPU and 1,536 MB in total. That fits the free demo too.

In your workspace: Shared, then CCNP ENCOR 350-401 guided labs, then 30 - Embedded Event Manager applets

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Level
Intermediate
Time
About 60 minutes
Nodes need
3 vCPU, 1,536 MB
Smallest plan
Lite

The scenario

Fernhill Freight's Bristol router (R1) has a primary WAN link to HQ and a 4G backup that costs money for every megabyte, so the backup interface (Gi0/1) is kept shut until it's needed. Today an engineer has to log in and bring it up by hand during an outage, and nobody captures any evidence of what happened.

You'll use the Embedded Event Manager (EEM) on R1 to:

  1. bring the 4G link up automatically when HQ stops answering over the primary link, and shut it again when the primary recovers;
  2. save evidence to flash the moment the WAN fails;
  3. take a health snapshot on demand, and log the probe results every minute;
  4. stop anyone reloading the router by accident.
DeviceInterfaceAddressConnects to
R1Gi0/010.0.12.1/30R2 Gi0/0 (primary)
R1Gi0/110.0.13.1/30 (shut)R3 Gi0/0 (4G provider)
R1Lo1010.20.10.1/24Bristol LAN
R2 (HQ)Lo0 / Lo1010.255.0.2/32 / 10.10.30.1/24–
R2Gi0/110.0.23.2/30R3 Gi0/1
R3 (4G)Gi0/0 / Gi0/110.0.13.2/30 / 10.0.23.1/30R1 / R2

R1 has a default route through R2 and a floating one (AD 10) through R3. R2 and R3 are already configured.

Topology: a triangle. R1 — R2 primary, R1 — R3 — R2 backup.

What you’ll practise

  • Explain EEM event detectors, actions and the applet structure
  • Automate configuration with applets triggered by object tracking
  • Automate data collection with syslog-triggered, timer and manual applets that write to flash
  • Intercept a CLI command with a synchronous applet
  • Verify registered policies and the EEM history, and test applets safely

The tasks

  1. Understand applets
  2. Give EEM something to watch
  3. Automate the backup link
  4. Collect evidence when the WAN fails
  5. Snapshots on demand and on a timer
  6. Block accidental reloads
  7. Test the failover end to end

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 Embedded Event Manager applets3 nodes, 3 links. Every link is listed as text below the diagram.R1R2R3Gi0/1Gi0/1Gi0/0Gi0/0Gi0/1Gi0/0
3 nodes, with the interface names each link uses.
Every link, as text
  • R1 Gi0/0 to R2 Gi0/0
  • R1 Gi0/1 to R3 Gi0/0
  • R3 Gi0/1 to R2 Gi0/1
Nodes in Embedded Event Manager applets, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
R1Cisco IOSvvios-adventerprisek9-m.spa.159-3.m91 vCPU, 512 MB
R2Cisco IOSvvios-adventerprisek9-m.spa.159-3.m91 vCPU, 512 MB
R3Cisco IOSvvios-adventerprisek9-m.spa.159-3.m91 vCPU, 512 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 CCNP ENCOR 350-401 guided labs.

  3. Open 30 - Embedded Event Manager applets 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 CCNP ENCOR labs

All CCNP ENCOR labs

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