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Nokia SR OS NRS I lab 3 of 14

Static routes, floating backups and BFD

Join two sites with static routes, add a floating backup, use BFD to notice a failure the port can't see, and finish with a black-hole route and ECMP.

Run this lab

It needs Standard: its 4 nodes are set to 6 vCPU and 10,624 MB in total.

In your workspace: Shared, then Nokia SR OS NRS I guided labs, then 03 - Static routes floating backups and BFD

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 10,624 MB together. Every lab plan includes every guided lab.

Level
Beginner
Time
About 50 minutes
Nodes need
6 vCPU, 10,624 MB
Smallest plan
Standard

The scenario

Rivermark's Ashby and Brenton offices each have a small LAN behind a router, R1 and R2. Two links join the routers: link A is the main circuit, and link B is a slower backup. The sites are so small that the team wants static routes, not a routing protocol, but a failure of link A must move traffic to link B on its own.

Every interface is already up, and H1 and H2 use their routers as gateways. Nothing can reach anything further than one hop away.

DeviceInterfacePortAddressConnects to
R1system-10.255.0.1/32
R1to-R2-a1/1/c1/110.0.12.1/30R2
R1to-R2-b1/1/c2/110.0.21.1/30R2
R1lan11/1/c3/1172.16.1.1/24H1
R2system-10.255.0.2/32
R2to-R1-a1/1/c1/110.0.12.2/30R1
R2to-R1-b1/1/c2/110.0.21.2/30R1
R2lan21/1/c3/1172.16.2.1/24H2
H1eth0-172.16.1.10/24 (gateway 172.16.1.1)R1
H2eth0-172.16.2.10/24 (gateway 172.16.2.1)R2

What you’ll practise

  • Read the routing table and explain route preference
  • Configure static routes with next hops
  • Build a floating backup route
  • Tie a static route to BFD
  • Use black-hole routes and ECMP

The tasks

  1. See what the router knows
  2. Add static routes
  3. Add a floating backup
  4. Make failure visible with BFD
  5. Stop summary traffic looping, and share two links

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 Static routes floating backups and BFD4 nodes, 4 links. Every link is listed as text below the diagram.R1R2H1H2p1/1/3eth0p1/1/3eth0p1/1/1p1/1/1p1/1/2p1/1/2
4 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
  • R1 p1/1/2 to R2 p1/1/2
  • R1 p1/1/3 to H1 eth0
  • R2 p1/1/3 to H2 eth0
Nodes in Static routes, floating backups and BFD, 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
H1Alpine Linuxclbalpinebase-alpine-base-3-20-31 vCPU, 512 MB
H2Alpine Linuxclbalpinebase-alpine-base-3-20-31 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 Nokia SR OS NRS I guided labs.

  3. Open 03 - Static routes floating backups and BFD 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.