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MikroTik MTCRE lab 7 of 14

Single-area OSPF on RouterOS 7

Bring up OSPF the RouterOS 7 way (instance, area, interface templates), watch neighbours reach Full and 2-Way, control the DR/BDR election on a shared segment, read the link-state database, and steer traffic with interface costs.

Run this lab

It needs Lite: its 6 nodes are set to 6 vCPU and 3,072 MB in total. That fits the free demo too.

In your workspace: Shared, then MikroTik MTCRE RouterOS v7 guided labs, then 07 - Single-area OSPF on RouterOS 7

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Level
Intermediate
Time
About 65 minutes
Nodes need
6 vCPU, 3,072 MB
Smallest plan
Lite

The scenario

Fernvale's static routes have become unmanageable, so the core is moving to OSPF. Four routers share a core switch (the Core LAN), and the branch router R4 also has two point-to-point links to R2 and R3. Design goals: R1 is always the designated router on the core LAN, R2 the backup, R3 and R4 never; router IDs come from loopbacks; LANs are advertised but never send hellos; and branch traffic to HQ prefers the R2 link.

RouterCore LAN (ether1/ether4)Other linksLANLoopback
R110.0.0.1/24, priority 200–192.168.1.1/2410.255.255.1
R210.0.0.2/24, priority 10010.0.24.1/30 → R4–10.255.255.2
R310.0.0.3/24, priority 010.0.34.1/30 → R4–10.255.255.3
R410.0.0.4/24 (ether4), priority 010.0.24.2/30, 10.0.34.2/30192.168.4.1/2410.255.255.4

What you’ll practise

  • Configure an OSPF instance, the backbone area and interface templates in RouterOS 7
  • Use loopback router IDs, passive interfaces and point-to-point network types
  • Explain neighbour states and why DROTHERs stay in 2-Way
  • Control the DR/BDR election with priorities
  • Read router and network LSAs
  • Steer paths with interface costs and recognise OSPF ECMP

The tasks

  1. Know how OSPF builds its database
  2. Configure OSPF on RouterOS 7
  3. Read the neighbours and the DR election
  4. Read the link-state database
  5. Steer traffic with cost
  6. Network types and multicast (reading)

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 Single-area OSPF on RouterOS 76 nodes and 1 network, 8 links. Every link is listed as text below the diagram.R1R2R3R4PC1PC2Core-LANether1ether1ether3eth0ether2eth0ether1ether4ether2ether1ether2ether2
6 nodes and 1 network, with the interface names each link uses. On a narrow screen, scroll the diagram sideways.
Every link, as text
  • R1 ether1 to Core-LAN (network)
  • R2 ether1 to Core-LAN (network)
  • R3 ether1 to Core-LAN (network)
  • R4 ether4 to Core-LAN (network)
  • R2 ether2 to R4 ether1
  • R3 ether2 to R4 ether2
  • R1 ether2 to PC1 eth0
  • R4 ether3 to PC2 eth0
Nodes in Single-area OSPF on RouterOS 7, 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
PC1VPCS hostBuilt in to EVE-NGCounted as 1 vCPU, 1,024 MB
PC2VPCS 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 07 - Single-area OSPF on RouterOS 7 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.