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CCNP Service Provider lab 10 of 23

SR-MPLS with IS-IS and SR to LDP interworking

Move a core from LDP to segment routing. Set the SRGB, give routers prefix SIDs, read adjacency SIDs, remove LDP from one router, and reach an LDP-only router through a mapping server.

Run this lab

It needs Standard: its 4 nodes are set to 4 vCPU and 10,240 MB in total.

In your workspace: Shared, then CCNP Service Provider guided labs, then 10 - SR-MPLS with IS-IS and SR to LDP interworking

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

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

The scenario

Fellgate Carrier wants to move its core from LDP to segment routing, a few routers at a time. The core is a line, R1, R2, R3 and R4, and all four run IS-IS and LDP today. R4 is a router that can't be upgraded yet. It will stay on LDP for at least a year, so traffic must still reach it from the SR part of the network.

You'll enable SR on R1, R2 and R3, read the labels it creates, remove LDP from R1, and stitch SR to LDP at the border, R3.

DeviceInterfaceAddressConnects to
R1Loopback010.255.0.1/32
R1Gi0/0/0/010.0.12.1/30R2 Gi0/0/0/0
R2Loopback010.255.0.2/32
R2Gi0/0/0/010.0.12.2/30R1 Gi0/0/0/0
R2Gi0/0/0/110.0.23.1/30R3 Gi0/0/0/0
R3Loopback010.255.0.3/32
R3Gi0/0/0/010.0.23.2/30R2 Gi0/0/0/1
R3Gi0/0/0/110.0.34.1/30R4 Gi0/0/0/0
R4Loopback010.255.0.4/32
R4Gi0/0/0/010.0.34.2/30R3 Gi0/0/0/1

What you’ll practise

  • Work out a label from the SRGB and an index
  • Enable SR-MPLS for IS-IS on IOS XR
  • Read prefix and adjacency SIDs
  • Remove LDP from an SR router
  • Use a mapping server to interwork SR with LDP

The tasks

  1. What segment routing changes
  2. Turn on SR-MPLS
  3. Adjacency SIDs
  4. Take LDP away from R1
  5. Why R4 can't be reached yet
  6. Give R4 a SID with a mapping server

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 SR-MPLS with IS-IS and SR to LDP interworking4 nodes, 3 links. Every link is listed as text below the diagram.R1R2R3R4Gi0/0/0/0Gi0/0/0/0Gi0/0/0/1Gi0/0/0/0Gi0/0/0/1Gi0/0/0/0
4 nodes, with the interface names each link uses. On a narrow screen, scroll the diagram sideways.
Every link, as text
  • R1 Gi0/0/0/0 to R2 Gi0/0/0/0
  • R2 Gi0/0/0/1 to R3 Gi0/0/0/0
  • R3 Gi0/0/0/1 to R4 Gi0/0/0/0
Nodes in SR-MPLS with IS-IS and SR to LDP interworking, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
R1Cisco IOS XRvxrv-k9-demo-6.3.11 vCPU, 2,560 MB
R2Cisco IOS XRvxrv-k9-demo-6.3.11 vCPU, 2,560 MB
R3Cisco IOS XRvxrv-k9-demo-6.3.11 vCPU, 2,560 MB
R4Cisco IOS XRvxrv-k9-demo-6.3.11 vCPU, 2,560 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 CCNP Service Provider guided labs.

  3. Open 10 - SR-MPLS with IS-IS and SR to LDP interworking 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 Cisco. The lab follows exam topics and isn’t vendor training material; vendor names identify the exams and the images in the workspace.