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MikroTik MTCRE lab 8 of 14

Multi-area OSPF, external routes and summarisation

Split Fernvale's OSPF network into areas: build two area border routers, summarise a branch area with an area range, redistribute customer networks as external type 1 and type 2 routes with a routing filter, and originate a default route from the Internet edge.

Run this lab

It needs Lite: its 6 nodes are set to 6 vCPU and 2,304 MB in total. That fits the free demo too.

In your workspace: Shared, then MikroTik MTCRE RouterOS v7 guided labs, then 08 - Multi-area OSPF external routes and summarisation

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Level
Advanced
Time
About 70 minutes
Nodes need
6 vCPU, 2,304 MB
Smallest plan
Lite

The scenario

Fernvale's OSPF network is growing, and every flap in a branch now makes every router rerun SPF. You'll split it into areas: area 1 for the branch behind R2, area 2 for the customer edge behind R4, and the backbone (area 0) in the middle. The core router R3 and the customer edge R5 already run OSPF; you add the branch, the two area border routers, the customer routes and the default route.

RouterRoleInterfaces and areas
R1Internal (area 1)ether1 10.0.12.1/30, LANs 10.1.0.0/24–10.1.2.0/24 and 10.1.10.0/24, loopback 10.255.255.1
R2ABR 1/0ether1 10.0.12.2/30 (area 1), ether2 10.0.23.1/30 (area 0), loopback (area 0)
R3Backbone, Internet edge10.0.23.2/30, 10.0.34.1/30 (area 0); 198.51.100.10 not in OSPF
R4ABR 0/2ether1 10.0.34.2/30 (area 0), ether2 10.0.45.1/30 (area 2), loopback (area 0)
R5Internal (area 2) and ASBR10.0.45.2/30 (area 2); customer networks 172.20.1.0/24 and 172.20.2.0/24

What you’ll practise

  • Explain backbone, internal, area border and AS boundary routers
  • Configure ABRs with interfaces in two areas
  • Read summary (type 3) and external (type 5) LSAs
  • Summarise an area with an area range on the ABR
  • Redistribute connected networks through a routing filter, setting external type 1 or 2
  • Originate a default route into OSPF

The tasks

  1. Areas and router types
  2. Build area 1 and the ABR R2
  3. Build the second ABR R4
  4. Summarise area 1 on its ABR
  5. Redistribute the customer networks as externals
  6. Originate a default route at the Internet edge

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 Multi-area OSPF external routes and summarisation6 nodes, 5 links. Every link is listed as text below the diagram.R1R2R3R4R5PC1ether2eth0ether1ether1ether2ether1ether2ether1ether2ether1
6 nodes, with the interface names each link uses. On a narrow screen, scroll the diagram sideways.
Every link, as text
  • R1 ether1 to R2 ether1
  • R2 ether2 to R3 ether1
  • R3 ether2 to R4 ether1
  • R4 ether2 to R5 ether1
  • R1 ether2 to PC1 eth0
Nodes in Multi-area OSPF, external routes and summarisation, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
R1MikroTik RouterOSmikrotik-7.14.21 vCPU, 256 MB
R2MikroTik RouterOSmikrotik-7.14.21 vCPU, 256 MB
R3MikroTik RouterOSmikrotik-7.14.21 vCPU, 256 MB
R4MikroTik RouterOSmikrotik-7.14.21 vCPU, 256 MB
R5MikroTik RouterOSmikrotik-7.14.21 vCPU, 256 MB
PC1VPCS hostBuilt in to EVE-NGCounted as 1 vCPU, 1,024 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 MikroTik MTCRE RouterOS v7 guided labs.

  3. Open 08 - Multi-area OSPF external routes and summarisation 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 MikroTik. The lab follows exam topics and isn’t vendor training material; vendor names identify the exams and the images in the workspace.