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HCIP-Datacom Core lab 12 of 14

Troubleshooting OSPF IS-IS and BGP

A network that passed no traffic after a bad change window. Six planted faults across OSPF, IS-IS and BGP: find them from the symptoms, working from the bottom up, and fix each one.

Run this lab

It needs Standard: its 7 nodes are set to 7 vCPU and 12,288 MB in total.

In your workspace: Shared, then HCIP-Datacom Core H12-821 guided labs, then 12 - Troubleshooting OSPF IS-IS and BGP

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 7 vCPU and 12,288 MB together. Every lab plan includes every guided lab.

Level
Advanced
Time
About 90 minutes
Nodes need
7 vCPU, 12,288 MB
Smallest plan
Standard

The scenario

Monday morning at Northwind. Last night's change window was supposed to tidy up the Bristol to partner path. Nothing works, the person who made the changes is on holiday, and all you have is the design. PC1 should reach PC2, and 203.0.113.1 at the partner. Six separate things are wrong.

The design:

  • Area 1: R1 and R2, a stub area. R1 gets out by the default route R2 sends.
  • Area 0: R2 and R3, with default OSPF timers.
  • iBGP in AS 100: R2 and R3, on loopbacks. R2 advertises 192.168.1.0/24. R3 is the border router, so it passes on routes from AS 200 with itself as next hop.
  • eBGP: R3 (AS 100) with R4 (AS 200) on 10.0.34.0/24. R3 should accept everything R4 sends.
  • IS-IS in AS 200: R4 and R5, both Level-2. R4 imports BGP into IS-IS and advertises 192.168.5.0/24 and 203.0.113.0/24.
RouterLoopBack0Interfaces
R11.1.1.1GE0/0/0 10.0.12.1/24, GE0/0/1 192.168.1.1/24 (PC1 .10)
R22.2.2.2GE0/0/0 10.0.12.2/24, GE0/0/1 10.0.23.2/24
R33.3.3.3GE0/0/0 10.0.23.3/24, GE0/0/1 10.0.34.3/24
R44.4.4.4GE0/0/0 10.0.34.4/24, GE0/0/1 10.0.45.4/24, LoopBack9 203.0.113.1/24
R55.5.5.5GE0/0/0 10.0.45.5/24, GE0/0/1 192.168.5.1/24 (PC2 .10)

What you’ll practise

  • Work through a fault from the bottom up: adjacency, routes, then policy
  • Tell OSPF adjacency faults apart using display ospf peer, error and interface output
  • Spot a level mismatch in IS-IS
  • Read a failed BGP session and an unresolved next hop
  • Find a route policy that silently drops routes

The tasks

  • Task 0: Load the starting configuration
  • Concept: a method for routing faults
  • Task 1: Fix OSPF in area 1
  • Task 2: Fix OSPF in area 0
  • Task 3: Fix IS-IS
  • Task 4: Fix the eBGP session
  • Task 5: Fix the next hop
  • Task 6: Fix the missing route

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 Troubleshooting OSPF IS-IS and BGP7 nodes, 6 links. Every link is listed as text below the diagram.R1R2R3R4R5PC1PC2GE0/0/0GE0/0/0GE0/0/1GE0/0/0GE0/0/1GE0/0/0GE0/0/1GE0/0/0GE0/0/1eth0GE0/0/1eth0
7 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
  • R3 GE0/0/1 to R4 GE0/0/0
  • R4 GE0/0/1 to R5 GE0/0/0
  • R1 GE0/0/1 to PC1 eth0
  • R5 GE0/0/1 to PC2 eth0
Nodes in Troubleshooting OSPF IS-IS and BGP, 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
R5Huawei 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 12 - Troubleshooting OSPF IS-IS and BGP 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.