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CCNP ENARSI lab 15 of 35

Bidirectional Forwarding Detection for OSPF, EIGRP, BGP and static routes

Measure how long OSPF, EIGRP and BGP take to notice a silent link failure, then add BFD so that every protocol, and a static route, reacts in about a second and a half.

Run this lab

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 15 - Bidirectional Forwarding Detection for OSPF EIGRP BGP and static routes

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Level
Intermediate
Time
About 55 minutes
Nodes need
4 vCPU, 2,048 MB
Smallest plan
Lite

The scenario

Halcyon Media's core router R1 talks OSPF to R2, EIGRP to R3 and eBGP to a partner (R4), plus a static route to the partner's extranet. The links run through a carrier's Ethernet service, so when the carrier has a problem, R1's interfaces stay up and only the routing protocol notices, after its hold or dead timer expires. During last month's carrier fault, video streams froze for 40 seconds on the OSPF path and three minutes on the BGP path.

You'll measure those delays, then add BFD so that every protocol learns about a failure in about 1.5 seconds.

DeviceInterfaceAddressProtocol to R1
R1Gi0/0 / Gi0/1 / Gi0/210.0.12.1 / 10.0.13.1 / 10.0.14.1 /24–
R1Lo110.1.1.1/24advertised in all three
R2Gi0/0, Lo110.0.12.2/24, 10.2.2.1/24OSPF area 0
R3Gi0/0, Lo110.0.13.3/24, 10.3.3.1/24EIGRP AS 100
R4Gi0/0, Lo1, Lo210.0.14.4/24, 10.4.4.1/24, 10.44.44.1/24eBGP 65004 (Lo1); static on R1 (Lo2)

What you’ll practise

  • Explain why routing protocols detect some failures slowly and how BFD helps
  • Configure BFD timers on interfaces and register OSPF, EIGRP, BGP and static routes as clients
  • Read show bfd neighbors and its details, including registered protocols
  • Measure failure detection with and without BFD

The tasks

  1. Measure detection without BFD
  2. Configure BFD on the links
  3. Register OSPF and EIGRP
  4. Register BGP and the static route
  5. Measure again

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 Bidirectional Forwarding Detection for OSPF EIGRP BGP and static routes4 nodes, 3 links. Every link is listed as text below the diagram.R1R2R3R4Gi0/2Gi0/0Gi0/0Gi0/0Gi0/1Gi0/0
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 R4 Gi0/0
Nodes in Bidirectional Forwarding Detection for OSPF, EIGRP, BGP and static routes, 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

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 15 - Bidirectional Forwarding Detection for OSPF EIGRP BGP and static routes 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.