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CCNP ENCOR lab 9 of 36

OSPF summarisation, filtering and area types

Shrink Fernhill's OSPF tables with inter-area and external summaries, keep a lab network and a partner extranet where they belong with filters, and turn the regional areas into a totally stubby area and an NSSA.

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It needs Lite: its 6 nodes are set to 6 vCPU and 3,584 MB in total. That fits the free demo too.

In your workspace: Shared, then CCNP ENCOR 350-401 guided labs, then 09 - OSPF summarisation filtering and area types

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Level
Advanced
Time
About 75 minutes
Nodes need
6 vCPU, 3,584 MB
Smallest plan
Lite

The scenario

The multi-area OSPF design you built in lab 8 is live and has grown. Bristol (area 1) now has four /24 VLANs, Glasgow (area 2) has a test bench and a partner extranet reached over a partner circuit, and every new VLAN appears in every router's table. The core team wants smaller tables, faster SPF runs and less churn when a branch VLAN flaps:

  • The core should see one route for Bristol's 10.20.0.0–10.20.3.0 and one for the partner extranet 172.16.0.0–172.16.3.0.
  • The Glasgow test bench (10.30.99.0/24) must never leave area 2.
  • R2 hosts the internet edge and must be the only source of the default route. It must also never use the partner extranet itself.
  • Bristol's small router (R4) should hold only its own area plus a default route. Glasgow must keep importing the partner routes, so it can't simply be a stub area.

OSPF is already running exactly as at the end of lab 8, with the extra VLANs and statics added.

DeviceRolePrefixes it owns
R1ABR area 0/1CORE 10.0.0.1, 10.0.14.1/30
R2Area 0, DR, internet edge10.10.30.0/24 (HQ servers), CORE 10.0.0.2
R3ABR area 0/2CORE 10.0.0.3, 10.0.35.1/30
R4Area 1 (Bristol)10.20.0.0/24 (Gi0/2, PC1), 10.20.1.0/24, 10.20.2.0/24, 10.20.3.0/24 (Lo11–13)
R5Area 2 (Glasgow), ASBR10.30.10.0/24 (Lo10), 10.30.99.0/24 (Lo99, test bench), statics 172.16.0.0/24–172.16.3.0/24
PC1Bristol staff PC10.20.0.10/24, gateway 10.20.0.1

Topology: R1, R2 and R3 share the CORE segment · R1 Gi0/1 — R4 Gi0/1 · R3 Gi0/1 — R5 Gi0/1 · R4 Gi0/2 — PC1.

What you’ll practise

  • Summarise inter-area routes on an ABR with area range and explain the Null0 discard route
  • Redistribute static routes on an ASBR and summarise them with summary-address
  • Filter type 3 LSAs between areas with area filter-list, and filter the local RIB with distribute-list
  • Configure stub, totally stubby and NSSA areas and predict what each router's table holds
  • Originate a default route into OSPF and trace which LSA type carries it into each area

The tasks

  1. Take a baseline
  2. Summarise Bristol on the ABR
  3. Make R5 an ASBR and summarise the extranet
  4. Keep the test bench in Glasgow
  5. Stop R2 from using the extranet
  6. Originate the default route at the internet edge
  7. Turn Bristol into a totally stubby area and Glasgow into an NSSA
  8. Prove it still works

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 OSPF summarisation filtering and area types6 nodes and 1 network, 6 links. Every link is listed as text below the diagram.R1R2R3R4R5PC1COREGi0/2eth0Gi0/0Gi0/1Gi0/1Gi0/1Gi0/1Gi0/0Gi0/0
6 nodes and 1 network, with the interface names each link uses. On a narrow screen, scroll the diagram sideways.
Every link, as text
  • R1 Gi0/0 to CORE (network)
  • R2 Gi0/0 to CORE (network)
  • R3 Gi0/0 to CORE (network)
  • R1 Gi0/1 to R4 Gi0/1
  • R3 Gi0/1 to R5 Gi0/1
  • R4 Gi0/2 to PC1 eth0
Nodes in OSPF summarisation, filtering and area types, 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
R4Cisco IOSvvios-adventerprisek9-m.spa.159-3.m91 vCPU, 512 MB
R5Cisco IOSvvios-adventerprisek9-m.spa.159-3.m91 vCPU, 512 MB
PC1VPCS hostBuilt in to EVE-NGCounted as 1 vCPU, 1,024 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 ENCOR 350-401 guided labs.

  3. Open 09 - OSPF summarisation filtering and area types 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.