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Arista EOS lab 16 of 20

IS-IS levels and areas for a WAN core

Build the IS-IS underlay of an MPLS core: a Level-2 backbone, a Level-1 area with two attached routers, PE loopbacks leaked down into Level 1, a metric that sets the working path, and authenticated hellos and LSPs.

Run this lab

It needs Standard: its 6 nodes are set to 6 vCPU and 9,216 MB in total.

In your workspace: Shared, then Arista EOS guided labs, then 16 - IS-IS levels and areas for a WAN core

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 9,216 MB together. Every lab plan includes every guided lab.

Level
Advanced
Time
About 75 minutes
Nodes need
6 vCPU, 9,216 MB
Smallest plan
Standard

The scenario

Northwind is replacing a leased WAN with its own MPLS core between two regions. Labels come in the next labs. First the core needs an IGP that carries every loopback, scales by level and keeps working when a link goes. You'll build it in IS-IS: a flat Level-2 backbone first, then a Level-1 area for the north region, with the PE loopbacks leaked down because MPLS will need them.

RouterRoleAreaFinal levelNETLoopback0
PE1North edge49.0001Level 149.0001.0000.0000.0001.0010.255.0.1/32
P1Core, north border49.0001Level 1 and 249.0001.0000.0000.0011.0010.255.0.11/32
P2Core, north border49.0001Level 1 and 249.0001.0000.0000.0012.0010.255.0.12/32
PE2South edge49.0002Level 249.0002.0000.0000.0002.0010.255.0.2/32
LinkAddresses
PE1 Et1 to P1 Et110.0.1.0 and 10.0.1.1 /31
PE1 Et2 to P2 Et110.0.2.0 and 10.0.2.1 /31
PE2 Et1 to P1 Et210.0.3.0 and 10.0.3.1 /31
PE2 Et2 to P2 Et210.0.4.0 and 10.0.4.1 /31
P1 Et3 to P2 Et310.0.5.0 and 10.0.5.1 /31

Host LANs: h1 192.168.1.10/24 behind PE1 Et3 (gateway .1), h2 192.168.2.10/24 behind PE2 Et3 (gateway .1).

What you’ll practise

  • Plan NETs, areas and levels for a four-router core
  • Bring up IS-IS on point-to-point links with passive loopbacks
  • Explain the attached bit and the default route it gives a Level-1 router
  • Leak loopbacks from Level 2 into Level 1 and read the Up/Down flag in an LSP
  • Set a working path with IS-IS metrics and prove it with traceroute
  • Authenticate hellos and LSPs with HMAC-MD5

The tasks

  1. Address the hosts
  2. Bring up a flat Level-2 backbone
  3. Make PE1 a Level-1 router
  4. Leak the PE loopbacks into Level 1
  5. Carry the host LANs and set the working path
  6. Authenticate hellos and LSPs

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 IS-IS levels and areas for a WAN core6 nodes, 7 links. Every link is listed as text below the diagram.PE1P1P2PE2h1h2Ethernet3eth0Ethernet3eth0Ethernet1Ethernet1Ethernet2Ethernet1Ethernet1Ethernet2Ethernet2Ethernet2Ethernet3Ethernet3
6 nodes, with the interface names each link uses. On a narrow screen, scroll the diagram sideways.
Every link, as text
  • PE1 Ethernet1 to P1 Ethernet1
  • PE1 Ethernet2 to P2 Ethernet1
  • PE2 Ethernet1 to P1 Ethernet2
  • PE2 Ethernet2 to P2 Ethernet2
  • P1 Ethernet3 to P2 Ethernet3
  • PE1 Ethernet3 to h1 eth0
  • PE2 Ethernet3 to h2 eth0
Nodes in IS-IS levels and areas for a WAN core, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
PE1Arista vEOSveos-4.33.1.1F1 vCPU, 2,048 MB
P1Arista vEOSveos-4.33.1.1F1 vCPU, 2,048 MB
P2Arista vEOSveos-4.33.1.1F1 vCPU, 2,048 MB
PE2Arista vEOSveos-4.33.1.1F1 vCPU, 2,048 MB
h1Alpine Linuxclbalpinebase-alpine-base-3-20-31 vCPU, 512 MB
h2Alpine 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 Arista EOS guided labs.

  3. Open 16 - IS-IS levels and areas for a WAN core 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 Arista Networks. The lab follows exam topics and isn’t vendor training material; vendor names identify the exams and the images in the workspace.