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Nokia SR OS NRS I lab 5 of 14

IS-IS levels and route leaking

Build a two-level IS-IS network across three routers, follow the attached default route, turn on wide metrics and leak one prefix from level 2 into level 1.

Run this lab

It needs Standard: its 3 nodes are set to 6 vCPU and 14,400 MB in total.

In your workspace: Shared, then Nokia SR OS NRS I guided labs, then 05 - IS-IS levels and route leaking

Run it on Standard from £5 a day

The free demo can’t run it: it has 6 vCPU and 8 GB, and this lab’s nodes need 6 vCPU and 14,400 MB together. Every lab plan includes every guided lab.

Level
Intermediate
Time
About 60 minutes
Nodes need
6 vCPU, 14,400 MB
Smallest plan
Standard

The scenario

Rivermark has bought a regional provider, and the new core will run IS-IS, as most large carriers do. Three routers come first. R1 at Ashby is an access router in area 49.0001. R2 at Brenton sits on the edge of that area and connects it to the backbone. R3 at Cardew is in the backbone, in area 49.0002, and holds the peering range 198.51.100.0/24 on its peering interface.

Your job is to get the two levels working, read the link-state database, and leak just one route down into level 1.

DeviceInterfacePortAddressConnects to
R1system-10.255.0.1/32
R1to-R21/1/c1/110.0.12.1/30R2
R2system-10.255.0.2/32
R2to-R11/1/c1/110.0.12.2/30R1
R2to-R31/1/c2/110.0.23.1/30R3
R3system-10.255.0.3/32
R3to-R21/1/c1/110.0.23.2/30R2
R3peering-198.51.100.1/24

What you’ll practise

  • Set area IDs and level capability per router and per interface
  • Read IS-IS adjacencies and the link-state database
  • Explain the attached bit and the default route it creates
  • Enable wide metrics at each level
  • Leak a level 2 route into level 1 with an export policy

The tasks

  1. Understand the two levels
  2. Bring up level 1
  3. Bring up level 2
  4. Follow the default route
  5. Turn on wide metrics
  6. Leak one route into level 1
  7. Change a metric in the MD-CLI

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 IS-IS levels and route leaking3 nodes, 2 links. Every link is listed as text below the diagram.R1R2R3p1/1/1p1/1/1p1/1/2p1/1/1
3 nodes, with the interface names each link uses. On a narrow screen, scroll the diagram sideways.
Every link, as text
  • R1 p1/1/1 to R2 p1/1/1
  • R2 p1/1/2 to R3 p1/1/1
Nodes in IS-IS levels and route leaking, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
R1Nokia Integrated router (VSR NG template)timos-ng-21.10.R12 vCPU, 4,800 MB
R2Nokia Integrated router (VSR NG template)timos-ng-21.10.R12 vCPU, 4,800 MB
R3Nokia Integrated router (VSR NG template)timos-ng-21.10.R12 vCPU, 4,800 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 Nokia SR OS NRS I guided labs.

  3. Open 05 - IS-IS levels and route leaking 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.

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