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CCNP ENARSI lab 3 of 35

EIGRP stub routing, summarisation, default routing and authentication

Shrink two branch routing tables to a single default route, summarise each branch's LANs into one prefix, stop HQ from querying the branches, and authenticate every EIGRP adjacency with HMAC-SHA-256 and MD5.

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It needs Lite: its 4 nodes are set to 4 vCPU and 2,048 MB in total. That fits the free demo too.

In your workspace: Shared, then CCNP ENARSI 300-410 guided labs, then 03 - EIGRP stub routing summarisation default routing and authentication

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Level
Intermediate
Time
About 70 minutes
Nodes need
4 vCPU, 2,048 MB
Smallest plan
Lite

The scenario

Fernhill Garden Centres has a head office router (R1) and two garden centres: Oakfield (R2) and Riverside (R3). Named-mode EIGRP (FERNHILL, AS 200) runs between them, and R1 has a static default route to the ISP. The design review found four problems: the EIGRP adjacencies aren't authenticated, every router carries every branch /24, HQ would query the branches whenever a route disappears, and the branches have no route to the Internet at all.

Fix all four. When you finish, each branch should carry only a default route from HQ (Riverside also gets one specific route to the data centre), HQ should see one summary per branch, and every adjacency should be authenticated.

DeviceInterfaceAddressConnects to
R1Gi0/010.0.12.1/24R2 Gi0/0
R1Gi0/110.0.13.1/24R3 Gi0/0
R1Gi0/2198.51.100.1/30ISP Gi0/0 198.51.100.2
R1Lo10010.1.100.1/24HQ data centre (simulated)
R2Lo10–Lo13172.16.0.1–172.16.3.1 /24Oakfield LANs
R3Lo10–Lo13172.16.4.1–172.16.7.1 /24Riverside LANs
ISPLo0203.0.113.10/32public web server
R*n*Lo010.255.0.n/32router ID n.n.n.n

Topology: a hub and two spokes (R1–R2, R1–R3) plus R1's Internet link. The ISP router doesn't run EIGRP; it has static routes back to 10.0.0.0/8 and 172.16.0.0/16.

What you’ll practise

  • Authenticate named-mode EIGRP with HMAC-SHA-256 and with an MD5 key chain
  • Summarise contiguous LANs with summary-address and explain the Null0 discard route
  • Configure EIGRP stub routers and see how they limit the query scope
  • Originate a default route with a 0.0.0.0/0 summary and leak one specific prefix with a leak map
  • Compare a summary default with a redistributed static default

The tasks

  1. Take a baseline
  2. Authenticate the adjacencies
  3. Summarise each branch
  4. Make the branches stub routers
  5. Give the branches a default route, and Riverside one extra route
  6. Test and compare

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 EIGRP stub routing summarisation default routing and authentication4 nodes, 3 links. Every link is listed as text below the diagram.R1R2R3ISPGi0/2Gi0/0Gi0/0Gi0/0Gi0/1Gi0/0
4 nodes, with the interface names each link uses. On a narrow screen, scroll the diagram sideways.
Every link, as text
  • R1 Gi0/0 to R2 Gi0/0
  • R1 Gi0/1 to R3 Gi0/0
  • R1 Gi0/2 to ISP Gi0/0
Nodes in EIGRP stub routing, summarisation, default routing and authentication, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
R1Cisco IOSvvios-adventerprisek9-m.spa.159-3.m91 vCPU, 512 MB
R2Cisco IOSvvios-adventerprisek9-m.spa.159-3.m91 vCPU, 512 MB
R3Cisco IOSvvios-adventerprisek9-m.spa.159-3.m91 vCPU, 512 MB
ISPCisco 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 03 - EIGRP stub routing summarisation default routing and authentication 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.