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CCNP ENARSI lab 23 of 35

DMVPN phase 3 with IKEv2 and IPsec protection

Turn a working phase 2 DMVPN into phase 3, so the hub can summarise while spokes still build direct tunnels through NHRP redirects and shortcuts, then encrypt every tunnel with an IKEv2 and IPsec profile.

Run this lab

It needs Lite: its 5 nodes are set to 5 vCPU and 2,560 MB in total. That fits the free demo too.

In your workspace: Shared, then CCNP ENARSI 300-410 guided labs, then 23 - DMVPN phase 3 with IKEv2 and IPsec protection

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Level
Advanced
Time
About 75 minutes
Nodes need
5 vCPU, 2,560 MB
Smallest plan
Lite

The scenario

Ibis Pharmacy's DMVPN (lab 22) works, but two problems have come up. The company plans 200 branches, and in phase 2 every spoke must carry every other spoke's LAN with that spoke as next hop: the hub can't summarise, so every branch router needs a full routing table. And the security team has noticed that the tunnels are plain GRE over the Internet: anyone on the path can read prescription images.

You'll move to phase 3, which lets the hub send just a summary and still gives direct spoke-to-spoke traffic, and then protect every tunnel with IPsec negotiated by IKEv2.

DevicePublic (NBMA) addressTunnel0LAN
HUB198.51.100.1172.16.0.1/2410.1.1.0/24
BR2203.0.113.2172.16.0.2/2410.2.2.0/24
BR3203.0.113.6172.16.0.3/2410.3.3.0/24
BR4203.0.113.10172.16.0.4/2410.4.4.0/24

Starting point: the phase 2 DMVPN from lab 22 (mGRE everywhere, EIGRP AS 10, hub with split horizon and next-hop-self disabled). IPsec settings: IKEv2 keyring DMVPN-KR with one wildcard peer and pre-shared key Ibis-Dmvpn-Psk, IKEv2 profile DMVPN-IKEV2, transform set DMVPN-TS (AES-256, SHA-256, transport mode), IPsec profile DMVPN-PROF.

What you’ll practise

  • Explain the difference between DMVPN phases 2 and 3 and why phase 3 scales better
  • Configure NHRP redirect on the hub and NHRP shortcut on the spokes
  • Summarise towards the spokes and still get direct spoke-to-spoke traffic
  • Build an IKEv2 keyring, IKEv2 profile, transform set and IPsec profile
  • Protect mGRE tunnels with tunnel protection and verify IKE and IPsec security associations

The tasks

  1. Look at phase 2's cost
  2. Convert to phase 3
  3. Watch a shortcut being built
  4. Build the IKEv2 and IPsec profiles
  5. Protect the tunnels

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 DMVPN phase 3 with IKEv2 and IPsec protection5 nodes, 4 links. Every link is listed as text below the diagram.HUBISPBR2BR3BR4Gi0/0Gi0/0Gi0/0Gi0/2Gi0/0Gi0/1Gi0/0Gi0/3
5 nodes, with the interface names each link uses. On a narrow screen, scroll the diagram sideways.
Every link, as text
  • HUB Gi0/0 to ISP Gi0/0
  • BR2 Gi0/0 to ISP Gi0/1
  • BR3 Gi0/0 to ISP Gi0/2
  • BR4 Gi0/0 to ISP Gi0/3
Nodes in DMVPN phase 3 with IKEv2 and IPsec protection, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
HUBCisco IOSvvios-adventerprisek9-m.spa.159-3.m91 vCPU, 512 MB
ISPCisco IOSvvios-adventerprisek9-m.spa.159-3.m91 vCPU, 512 MB
BR2Cisco IOSvvios-adventerprisek9-m.spa.159-3.m91 vCPU, 512 MB
BR3Cisco IOSvvios-adventerprisek9-m.spa.159-3.m91 vCPU, 512 MB
BR4Cisco IOSvvios-adventerprisek9-m.spa.159-3.m91 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 CCNP ENARSI 300-410 guided labs.

  3. Open 23 - DMVPN phase 3 with IKEv2 and IPsec protection 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.