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HCIP-Datacom Core lab 4 of 14

BGP attributes and route reflectors

Give a dual-homed AS one route reflector, then steer traffic out with Local_Pref and in with MED and AS_Path, using the path selection order to explain every result.

Run this lab

It needs Standard: its 6 nodes are set to 6 vCPU and 10,240 MB in total.

In your workspace: Shared, then HCIP-Datacom Core H12-821 guided labs, then 04 - BGP attributes and route reflectors

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 6 vCPU and 10,240 MB together. Every lab plan includes every guided lab.

Level
Advanced
Time
About 90 minutes
Nodes need
6 vCPU, 10,240 MB
Smallest plan
Standard

The scenario

Northwind (AS 100) has two Internet links, from R2 and R3, both to its provider R4 (AS 200). R1 is the core router and will be the route reflector, so nobody has to build a full iBGP mesh. OSPF already runs inside AS 100. Finance wants traffic to 20.0.1.0/24 to leave through R3, and each of Northwind's two networks to arrive over a chosen link.

RouterASLoopBack0Links
R1 (RR)1001.1.1.1GE0/0/0 10.0.12.1/24, GE0/0/1 10.0.13.1/24, GE0/0/2 192.168.1.1/24 (PC1 .10), LoopBack1 192.168.2.1/24
R21002.2.2.2GE0/0/0 10.0.12.2/24, GE0/0/1 10.0.24.2/24 (to R4)
R31003.3.3.3GE0/0/0 10.0.13.3/24, GE0/0/1 10.0.34.3/24 (to R4)
R4200noneGE0/0/0 10.0.24.4/24, GE0/0/1 10.0.34.4/24, GE0/0/2 20.0.1.1/24 (PC2 .10), LoopBack1 20.0.2.1/24

What you’ll practise

  • Build iBGP over loopbacks with a route reflector and two clients
  • Solve the next-hop problem with next-hop-local
  • Read Originator_ID and Cluster_List on a reflected route
  • Steer outbound traffic with Local_Pref and inbound traffic with AS_Path and MED
  • Walk through VRP's BGP path selection order

The tasks

  • Task 0: Load the starting configuration
  • Concept: why route reflectors
  • Task 1: Build the BGP sessions
  • Concept: the next-hop problem
  • Task 2: Fix the next hop
  • Concept: path selection on VRP
  • Task 3: Leave through R3 for 20.0.1.0/24
  • Concept: MED and AS_Path
  • Task 4: Choose how traffic comes in

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 attributes and route reflectors6 nodes, 6 links. Every link is listed as text below the diagram.R1R2R3R4PC1PC2GE0/0/0GE0/0/0GE0/0/1GE0/0/0GE0/0/1GE0/0/0GE0/0/1GE0/0/1GE0/0/2eth0GE0/0/2eth0
6 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
  • R1 GE0/0/1 to R3 GE0/0/0
  • R2 GE0/0/1 to R4 GE0/0/0
  • R3 GE0/0/1 to R4 GE0/0/1
  • R1 GE0/0/2 to PC1 eth0
  • R4 GE0/0/2 to PC2 eth0
Nodes in BGP attributes and route reflectors, 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
PC2VPCS 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 04 - BGP attributes and route reflectors 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.