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Aruba CX lab 11 of 16

Troubleshooting a campus with five planted faults

A branch was rebuilt over the weekend and nothing works properly: half the LAG is missing, one VLAN can't reach its gateway, the access switch can't be managed and nobody reaches the application server. Find and fix five planted faults on AOS-CX with a bottom-up method.

Run this lab

It needs Standard: its 5 nodes are set to 8 vCPU and 10,240 MB in total.

In your workspace: Shared, then HPE Aruba Networking CX switching guided labs, then 11 - Troubleshooting a campus with five planted faults

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

Level
Advanced
Time
About 75 minutes
Nodes need
8 vCPU, 10,240 MB
Smallest plan
Standard

The scenario

Northwind's Leeds depot was re-cabled and re-configured over the weekend from a design that was correct. On Monday:

  • staff PCs (VLAN 10, h10) can't reach their gateway or the application server 10.99.99.1;
  • scanners (VLAN 20, h20) can't reach their gateway;
  • the monitoring system can't reach acc1 on 10.0.99.2 and reports the uplink LAG as degraded.

There are five faults. Find each with evidence, fix it with the smallest change, and verify.

Design itemValue
core1–acc1lag1 = 1/1/1 + 1/1/2 on both, LACP active, trunk native VLAN 1, allowed VLANs 10, 20, 99
Gateways (core1)vlan 10 10.10.10.1/24 · vlan 20 10.10.20.1/24 · vlan 99 10.0.99.1/24
acc1 managementvlan 99 10.0.99.2/24, default route via 10.0.99.1
core1–wan11/1/3 10.0.0.1/30 – wan1 1/1/1 10.0.0.2/30, OSPF area 0, point-to-point
wan1application server loopback 10.99.99.1/32 in OSPF
Hostsh10 10.10.10.11/24 via 10.10.10.1 · h20 10.10.20.11/24 via 10.10.20.1

What you’ll practise

  • Troubleshoot bottom-up: physical and LAG, VLANs and trunks, IP addressing, routing
  • Use show lag, show lacp interfaces, show vlan, show interface and show ip ospf neighbors to localise faults
  • Recognise VLAN, native VLAN and IP mismatches from their symptoms
  • Write a remediation plan and verify each fix

The tasks

  1. Reproduce
  2. Links and the LAG
  3. VLANs and the trunk
  4. IP addressing
  5. Routing

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 a campus with five planted faults5 nodes, 5 links. Every link is listed as text below the diagram.core1acc1wan1h10h201/1/11/1/11/1/21/1/21/1/3eth01/1/4eth01/1/31/1/1
5 nodes, with the interface names each link uses. On a narrow screen, scroll the diagram sideways.
Every link, as text
  • core1 1/1/1 to acc1 1/1/1
  • core1 1/1/2 to acc1 1/1/2
  • core1 1/1/3 to wan1 1/1/1
  • acc1 1/1/3 to h10 eth0
  • acc1 1/1/4 to h20 eth0
Nodes in Troubleshooting a campus with five planted faults, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
core1Aruba AOS-CX virtual switcharubacx-10.142 vCPU, 3,072 MB
acc1Aruba AOS-CX virtual switcharubacx-10.142 vCPU, 3,072 MB
wan1Aruba AOS-CX virtual switcharubacx-10.142 vCPU, 3,072 MB
h10Alpine Linuxclbalpinebase-alpine-base-3-20-31 vCPU, 512 MB
h20Alpine 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 HPE Aruba Networking CX switching guided labs.

  3. Open 11 - Troubleshooting a campus with five planted faults 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 Hewlett Packard Enterprise. The lab follows exam topics and isn’t vendor training material; vendor names identify the exams and the images in the workspace.