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HCIP-Datacom Core lab 5 of 14

BGP route control with filters and communities

Run the policy of a small transit provider: peer groups, prefix lists, AS_Path filters, standard and well-known communities, route policies, aggregation and route limits.

Run this lab

It needs Standard: its 5 nodes are set to 5 vCPU and 9,216 MB in total.

In your workspace: Shared, then HCIP-Datacom Core H12-821 guided labs, then 05 - BGP route control with filters and communities

Run it on Standard from £5 a day

The free demo can’t run it: it has 6 vCPU and 8 GB, and this lab’s nodes need 5 vCPU and 9,216 MB together. Every lab plan includes every guided lab.

Level
Advanced
Time
About 90 minutes
Nodes need
5 vCPU, 9,216 MB
Smallest plan
Standard

The scenario

Northwind Connect, the group's small ISP (AS 65002, R2), carries two customers, R1 and R3, and buys transit from R4. You run R2's policy. The customers make mistakes: R1 leaks a private network, and R3 passes on a route it has no business carrying. Each customer's tag requests must also be honoured, and the upstream should see tidy aggregates rather than every customer /24.

RouterASLinksNetworks it advertises
R165001GE0/0/0 10.0.12.1/2410.1.0.0/24 to 10.1.3.0/24, 10.2.0.0/24, 172.31.1.0/24 (should never have been advertised)
R265002GE0/0/0 10.0.12.2/24, GE0/0/1 10.0.23.2/24, GE0/0/2 10.0.24.2/24None
R365003GE0/0/0 10.0.23.3/24, GE0/0/1 10.3.0.1/24 (PC1 .10)10.3.0.0/24, 10.3.1.0/24, 172.20.0.0/24 (with an extra AS on the path, as if R3 were transit for AS 64999)
R465004GE0/0/0 10.0.24.4/24203.0.113.0/24

What you’ll practise

  • Use a peer group for shared configuration
  • Filter received routes with an IP prefix list and an AS_Path filter
  • Set and act on communities, including no-export
  • Build a route policy that matches a community and changes the AS_Path
  • Aggregate customer routes and suppress the specifics
  • Protect a session with a route limit

The tasks

  • Task 0: Load the starting configuration
  • Concept: peer groups
  • Task 1: Bring up the sessions
  • Concept: prefix lists
  • Task 2: Accept only R1's registered networks
  • Concept: AS_Path filters
  • Task 3: Accept only R3's own routes
  • Concept: communities
  • Task 4: Honour the customers' tags
  • Concept: aggregation
  • Task 5: Aggregate R1's networks
  • Task 6: Limit what R3 can send

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 BGP route control with filters and communities5 nodes, 4 links. Every link is listed as text below the diagram.R1R2R3R4PC1GE0/0/1eth0GE0/0/0GE0/0/0GE0/0/1GE0/0/0GE0/0/2GE0/0/0
5 nodes, with the interface names each link uses. On a narrow screen, scroll the diagram sideways.
Every link, as text
  • R1 GE0/0/0 to R2 GE0/0/0
  • R2 GE0/0/1 to R3 GE0/0/0
  • R2 GE0/0/2 to R4 GE0/0/0
  • R3 GE0/0/1 to PC1 eth0
Nodes in BGP route control with filters and communities, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
R1Huawei AR1000V routerhuaweiar1k-5.170-V300R022C00SPC100-Auto-update-esn1 vCPU, 2,048 MB
R2Huawei AR1000V routerhuaweiar1k-5.170-V300R022C00SPC100-Auto-update-esn1 vCPU, 2,048 MB
R3Huawei AR1000V routerhuaweiar1k-5.170-V300R022C00SPC100-Auto-update-esn1 vCPU, 2,048 MB
R4Huawei AR1000V routerhuaweiar1k-5.170-V300R022C00SPC100-Auto-update-esn1 vCPU, 2,048 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 HCIP-Datacom Core H12-821 guided labs.

  3. Open 05 - BGP route control with filters and communities 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 Huawei. The lab follows exam topics and isn’t vendor training material; vendor names identify the exams and the images in the workspace.