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CCNP ENARSI lab 22 of 35

DMVPN phases 1 and 2 with NHRP and EIGRP

Build a single-hub DMVPN over an Internet provider: first as phase 1 hub-and-spoke with point-to-point GRE spokes, then as phase 2 with multipoint GRE spokes that build direct spoke-to-spoke tunnels on demand through NHRP.

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 22 - DMVPN phases 1 and 2 with NHRP and EIGRP

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Level
Advanced
Time
About 85 minutes
Nodes need
5 vCPU, 2,560 MB
Smallest plan
Lite

The scenario

Ibis Pharmacy has a head office (HUB) and three branches (BR2, BR3, BR4), all connected to the Internet through the same provider (ISP). Each site has only a public address; the branches' addresses could change. The company wants a private WAN over the Internet in which adding a branch never requires changing the hub, and branches can talk directly to each other (pharmacists share prescription images) without hair-pinning through head office.

That is DMVPN: one multipoint GRE tunnel interface on every router, with NHRP mapping tunnel addresses to public (NBMA) addresses. You'll build phase 1 first, then upgrade to phase 2. (Phase 3 and IPsec follow in lab 23.)

DevicePublic (NBMA) addressTunnel0LAN
HUB198.51.100.1/30 (gateway .2)172.16.0.1/2410.1.1.0/24
BR2203.0.113.2/30 (gateway .1)172.16.0.2/2410.2.2.0/24
BR3203.0.113.6/30 (gateway .5)172.16.0.3/2410.3.3.0/24
BR4203.0.113.10/30 (gateway .9)172.16.0.4/2410.4.4.0/24

Common settings: NHRP network ID 100, NHRP authentication DMVPNKEY, tunnel key 100, IP MTU 1400, TCP MSS 1360, EIGRP AS 10 over the tunnel.

What you’ll practise

  • Configure an mGRE hub and GRE/mGRE spokes with NHRP registration
  • Explain NHRP mappings, registration with the NHS and dynamic hub mappings
  • Run EIGRP over DMVPN and control split horizon and next-hop-self on the hub
  • Convert phase 1 to phase 2 and trigger dynamic spoke-to-spoke tunnels
  • Read show dmvpn, show ip nhrp and traceroutes to prove the data path

The tasks

  1. Check the underlay
  2. Build the hub
  3. Phase 1 spokes: point-to-point GRE to the hub
  4. Route over the DMVPN with EIGRP
  5. Upgrade to phase 2: direct spoke-to-spoke tunnels
  6. Read NHRP

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 phases 1 and 2 with NHRP and EIGRP5 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 phases 1 and 2 with NHRP and EIGRP, 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 22 - DMVPN phases 1 and 2 with NHRP and EIGRP 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.