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HCIP-Datacom Core lab 9 of 14

Multicast with IGMP and PIM-SM

Stream to a group across three routers: PIM-SM with a static RP, IGMP on the receiver LAN, the shared tree, the switch to the shortest-path tree, then a dynamic RP with BSR. A real sender and receiver prove it.

Run this lab

It needs Standard: its 5 nodes are set to 5 vCPU and 8,192 MB in total. That fits the free demo too.

In your workspace: Shared, then HCIP-Datacom Core H12-821 guided labs, then 09 - Multicast with IGMP and PIM-SM

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Level
Advanced
Time
About 80 minutes
Nodes need
5 vCPU, 8,192 MB
Smallest plan
Standard

The scenario

Northwind's head office streams its all-hands to every site, one copy per viewer, and the Leeds link is full by the second speaker. Multicast sends one copy and branches it only where it's wanted. H1 is the streaming server, H2 stands for the Leeds viewers, and R2 sits in the middle of the network as the natural meeting point. OSPF is running. Your job is the multicast layer.

DeviceAddresses
R1LoopBack0 1.1.1.1, GE0/0/0 10.0.12.1/24, GE0/0/1 10.0.13.1/24, GE0/0/2 10.1.1.1/24 (H1)
R2LoopBack0 2.2.2.2, GE0/0/0 10.0.12.2/24, GE0/0/1 10.0.23.2/24
R3LoopBack0 3.3.3.3, GE0/0/0 10.0.13.3/24, GE0/0/1 10.0.23.3/24, GE0/0/2 10.3.3.1/24 (H2)
H110.1.1.10, sends to 239.1.1.1 with /root/mcsend.py
H210.3.3.10, joins 239.1.1.1 with /root/mcrecv.py

Both scripts are ordinary Python sockets, already on the hosts. The receiver shows each frame as it arrives.

What you’ll practise

  • Explain groups, IGMP, RPF, the RP and the two kinds of tree
  • Enable multicast routing and PIM-SM
  • Configure a static RP and then a dynamic one with BSR
  • Read (*,G) and (S,G) entries, and the upstream neighbour in each
  • See the shared tree give way to the shortest-path tree

The tasks

  • Task 0: Load the starting configuration
  • Concept: how multicast finds its way
  • Task 1: Turn on multicast and PIM-SM
  • Task 2: Set a static RP
  • Concept: IGMP
  • Task 3: Join the group from H2
  • Concept: the shortest-path tree
  • Task 4: Start the stream
  • Concept: finding the RP automatically
  • Task 5: Replace the static RP with BSR
  • Task 6: Finish the move

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 Multicast with IGMP and PIM-SM5 nodes, 5 links. Every link is listed as text below the diagram.R1R2R3H1H2GE0/0/2eth0GE0/0/2eth0GE0/0/0GE0/0/0GE0/0/1GE0/0/1GE0/0/1GE0/0/0
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
  • R1 GE0/0/1 to R3 GE0/0/0
  • R2 GE0/0/1 to R3 GE0/0/1
  • R1 GE0/0/2 to H1 eth0
  • R3 GE0/0/2 to H2 eth0
Nodes in Multicast with IGMP and PIM-SM, 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
H1EVE-NG GUI server (Docker)eve-gui-server:latest1 vCPU, 1,024 MB
H2EVE-NG GUI server (Docker)eve-gui-server:latest1 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 09 - Multicast with IGMP and PIM-SM 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.