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HCIP-Datacom Core lab 2 of 14

OSPF route control

Join a stranded area with a virtual link, summarise at the ABR and the ASBR, keep a network inside its area, send a default route, steer traffic with cost, and protect the backbone with HMAC-SHA256.

Run this lab

It needs Standard: its 6 nodes are set to 6 vCPU and 10,240 MB in total.

In your workspace: Shared, then HCIP-Datacom Core H12-821 guided labs, then 02 - OSPF route control

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 10,240 MB together. Every lab plan includes every guided lab.

Level
Advanced
Time
About 80 minutes
Nodes need
6 vCPU, 10,240 MB
Smallest plan
Standard

The scenario

Bristol (area 1) has four office networks and a lab network that must stay in Bristol. Leeds has two partner networks. A new Leeds office LAN has just been put in area 3 on R4, and nobody can reach it, because area 3 doesn't touch the backbone. The core link between R2 and R3 has been doubled, and security wants the backbone authenticated. Your job is to fix the stranded area and then make OSPF advertise only what it should.

RouterLoopBack0Interfaces
R11.1.1.1GE0/0/0 10.0.12.1/24, GE0/0/1 192.168.1.1/24 (PC1 .10), LoopBack1-4 172.16.0-3.1/24 (offices), LoopBack5 10.99.0.1/24 (lab network)
R2 (ABR)2.2.2.2GE0/0/0 10.0.12.2/24 (area 1), GE0/0/1 10.0.23.2/24, GE0/0/2 10.0.32.2/24 (area 0)
R3 (ABR)3.3.3.3GE0/0/0 10.0.23.3/24, GE0/0/2 10.0.32.3/24 (area 0), GE0/0/1 10.0.34.3/24 (area 2)
R4 (ASBR)4.4.4.4GE0/0/0 10.0.34.4/24 (area 2), GE0/0/1 192.168.4.1/24 (area 3, PC2 .10), LoopBack8 198.51.100.1/25, LoopBack9 198.51.100.129/25 (partners)

The office and lab loopbacks use ospf network-type broadcast, so they appear as /24 routes rather than /32.

What you’ll practise

  • Repair a disconnected area with a virtual link
  • Summarise inter-area routes with abr-summary and external routes with asbr-summary
  • Filter Type 3 LSAs at an ABR, and say how that differs from filter-policy import
  • Originate a default route with default-route-advertise
  • Change ECMP to a single path with interface cost
  • Authenticate an area with HMAC-SHA256

The tasks

  • Task 0: Load the starting configuration
  • Concept: virtual links
  • Task 1: Connect area 3
  • Concept: summarising
  • Task 2: Summarise the Bristol offices
  • Concept: two kinds of filter
  • Task 3: Keep the lab network in Bristol
  • Task 4: Summarise the partner networks
  • Concept: default routes in OSPF
  • Task 5: Send a default route from R3
  • Concept: cost and reference bandwidth
  • Task 6: Make GE0/0/2 the backup core link
  • Concept: authentication
  • Task 7: Authenticate the backbone

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 OSPF route control6 nodes, 6 links. Every link is listed as text below the diagram.R1R2R3R4PC1PC2GE0/0/1eth0GE0/0/1eth0GE0/0/0GE0/0/0GE0/0/1GE0/0/0GE0/0/2GE0/0/2GE0/0/1GE0/0/0
6 nodes, with the interface names each link uses. On a narrow screen, scroll the diagram sideways.
Every link, as text
  • R1 GE0/0/0 to R2 GE0/0/0
  • R2 GE0/0/1 to R3 GE0/0/0
  • R2 GE0/0/2 to R3 GE0/0/2
  • R3 GE0/0/1 to R4 GE0/0/0
  • R1 GE0/0/1 to PC1 eth0
  • R4 GE0/0/1 to PC2 eth0
Nodes in OSPF route control, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
R1Huawei AR1000V routerhuaweiar1k-5.170-V300R022C00SPC100-Auto-update-esn1 vCPU, 2,048 MB
R2Huawei AR1000V routerhuaweiar1k-5.170-V300R022C00SPC100-Auto-update-esn1 vCPU, 2,048 MB
R3Huawei AR1000V routerhuaweiar1k-5.170-V300R022C00SPC100-Auto-update-esn1 vCPU, 2,048 MB
R4Huawei AR1000V routerhuaweiar1k-5.170-V300R022C00SPC100-Auto-update-esn1 vCPU, 2,048 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 HCIP-Datacom Core H12-821 guided labs.

  3. Open 02 - OSPF route control 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 Huawei. The lab follows exam topics and isn’t vendor training material; vendor names identify the exams and the images in the workspace.