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MikroTik MTCINE lab 12 of 12

Capstone - troubleshoot an ISP with BGP and L3VPN and VPLS services

Monday morning at Fernvale: an Internet customer is offline, Oakridge's VPN is down and its office routes are leaking to the upstream, and Larkspur's VPLS has lost a depot. Work through ten routers, from BGP sessions to labels to route targets, find the five planted faults and prove every service works.

Run this lab

It needs Standard: its 10 nodes are set to 10 vCPU and 2,560 MB in total.

In your workspace: Shared, then MikroTik MTCINE RouterOS v7 guided labs, then 12 - Capstone - troubleshoot an ISP with BGP and L3VPN and VPLS services

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 10 vCPU and 2,560 MB together. Every lab plan includes every guided lab.

Level
Advanced
Time
About 150 minutes
Nodes need
10 vCPU, 2,560 MB
Smallest plan
Standard

The scenario

Fernvale ran a weekend maintenance window and changed several routers. On Monday morning three customers call:

  • Copperleaf Hosting (AS 65010, an Internet customer on PE3): "we have no Internet at all".
  • Oakridge Clinic (L3VPN): "head office and branch can't see each other". Northgate's NOC also mails: "you are announcing 192.168.10.0/24 to us, please stop".
  • Larkspur Logistics (BGP VPLS): "depot 2 has dropped off our network".

Plain IP inside the core is fine: OSPF is up everywhere and every loopback pings. Five faults were introduced. Find them all, fix them with the smallest change, and prove each service works. The intended design is in the notes on the canvas and in the table.

RouterLoopbackRole and services
EDGE10.255.255.1eBGP to Northgate (203.0.113.1, AS 64510); announces 198.51.100.0/24; iBGP (IPv4) to PE2 and PE3, next-hop-self
P10.255.255.2core label switch: OSPF and LDP on all three core links
PE210.255.255.3Oakridge HQ (VRF OAK, eBGP AS 65201, ether2), Larkspur depot 1 (VE 1, ether3); iBGP VPNv4 and l2vpn to PE3
PE310.255.255.4Oakridge branch (VRF OAK, OSPF, ether2), Larkspur depot 2 (VE 2, ether3), Copperleaf (eBGP AS 65010, ether4)

What you’ll practise

  • Troubleshoot a multi-service MPLS network methodically, one service and one layer at a time
  • Diagnose eBGP and iBGP faults: session parameters and unusable next hops
  • Diagnose LDP faults that break VPN and VPLS traffic while plain IP still works
  • Diagnose VRF and route-target faults in L3VPN and BGP VPLS
  • Explain the impact of each fault and prove the repair with targeted checks

The tasks

  1. Copperleaf's Internet service
  2. The core's labels
  3. Oakridge's L3VPN, and the leak
  4. Larkspur's VPLS
  5. Write the incident report

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 Capstone - troubleshoot an ISP with BGP and L3VPN and VPLS services10 nodes, 9 links. Every link is listed as text below the diagram.NORTHGATEEDGEPPE2PE3CE-OAK1CE-LARK1CE-OAK2CE-LARK2COPPERLEAFether1ether1ether2ether1ether3ether1ether3ether1ether2ether1ether2ether1ether2ether1ether3ether1ether4ether1
10 nodes, with the interface names each link uses. On a narrow screen, scroll the diagram sideways.
Every link, as text
  • NORTHGATE ether1 to EDGE ether1
  • EDGE ether2 to P ether1
  • P ether2 to PE2 ether1
  • P ether3 to PE3 ether1
  • PE2 ether2 to CE-OAK1 ether1
  • PE2 ether3 to CE-LARK1 ether1
  • PE3 ether2 to CE-OAK2 ether1
  • PE3 ether3 to CE-LARK2 ether1
  • PE3 ether4 to COPPERLEAF ether1
Nodes in Capstone - troubleshoot an ISP with BGP and L3VPN and VPLS services, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
NORTHGATEMikroTik RouterOSmikrotik-7.14.21 vCPU, 256 MB
EDGEMikroTik RouterOSmikrotik-7.14.21 vCPU, 256 MB
PMikroTik RouterOSmikrotik-7.14.21 vCPU, 256 MB
PE2MikroTik RouterOSmikrotik-7.14.21 vCPU, 256 MB
PE3MikroTik RouterOSmikrotik-7.14.21 vCPU, 256 MB
CE-OAK1MikroTik RouterOSmikrotik-7.14.21 vCPU, 256 MB
CE-LARK1MikroTik RouterOSmikrotik-7.14.21 vCPU, 256 MB
CE-OAK2MikroTik RouterOSmikrotik-7.14.21 vCPU, 256 MB
CE-LARK2MikroTik RouterOSmikrotik-7.14.21 vCPU, 256 MB
COPPERLEAFMikroTik RouterOSmikrotik-7.14.21 vCPU, 256 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 MTCINE RouterOS v7 guided labs.

  3. Open 12 - Capstone - troubleshoot an ISP with BGP and L3VPN and VPLS services 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.