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CCNP ENCOR lab 22 of 36

Multicast: PIM sparse mode, IGMP, RPF and SSM

Deliver Fernhill's warehouse paging stream with PIM sparse mode: join a group with IGMP, watch the shared tree turn into a shortest-path tree, check RPF, move the RP to BSR and finish with source-specific multicast.

Run this lab

It needs Lite: its 5 nodes are set to 5 vCPU and 2,560 MB in total. That fits the free demo too.

In your workspace: Shared, then CCNP ENCOR 350-401 guided labs, then 22 - Multicast - PIM sparse mode IGMP RPF and SSM

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Level
Advanced
Time
About 75 minutes
Nodes need
5 vCPU, 2,560 MB
Smallest plan
Lite

The scenario

Fernhill Freight's Leeds warehouse is replacing its old paging system with IP speakers. A paging server (SRC, 10.1.1.10) in the server room sends one audio stream to a multicast group, and every speaker controller that wants it joins the group. Sending one copy per speaker over unicast would flood the WAN links, so you'll build multicast routing across R1, R2 and R3.

First the stream uses any-source multicast (ASM) on 239.1.1.1 with R2 as rendezvous point. Then the new controllers, which support IGMPv3, move to source-specific multicast on 232.1.1.1.

DeviceInterfaceAddressRole
SRCGi0/010.1.1.10/24, gateway 10.1.1.1multicast source (host mode)
R1Gi0/0 / Gi0/1 / Gi0/210.1.1.1/24 / 10.0.12.1/30 / 10.0.13.1/30first-hop router (FHR)
R2Gi0/0 / Gi0/1 / Lo010.0.12.2/30 / 10.0.23.1/30 / 10.255.0.2/32rendezvous point (RP)
R3Gi0/0 / Gi0/1 / Gi0/210.0.23.2/30 / 10.3.3.1/24 / 10.0.13.2/30last-hop router (LHR)
RCVGi0/010.3.3.10/24, gateway 10.3.3.1speaker controller (host mode)

OSPF already provides unicast reachability. SRC and RCV are routers in host mode (no ip routing) standing in for a server and a controller.

Topology: SRC — R1; R1 — R2 — R3 and a direct R1 — R3 link; R3 — RCV.

What you’ll practise

  • Explain multicast addressing, IGMPv2 and IGMPv3, and the roles of FHR, LHR and RP
  • Enable PIM sparse mode with a static RP and verify PIM neighbours and RP mappings
  • Follow (*,G) and (S,G) state through the network, including the SPT switchover
  • Use the RPF check to predict which interface multicast must arrive on
  • Replace the static RP with BSR, and deliver an SSM group without any RP

The tasks

  1. Multicast in two minutes
  2. Turn on multicast routing and PIM
  3. Join the group from the receiver
  4. Send the stream and watch the trees
  5. Make the RP dynamic with BSR
  6. Move the new controllers to SSM
  7. Know the rest of the family

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 - PIM sparse mode IGMP RPF and SSM5 nodes, 5 links. Every link is listed as text below the diagram.SRCR1R2R3RCVGi0/1Gi0/0Gi0/0Gi0/0Gi0/1Gi0/0Gi0/1Gi0/0Gi0/2Gi0/2
5 nodes, with the interface names each link uses. On a narrow screen, scroll the diagram sideways.
Every link, as text
  • SRC Gi0/0 to R1 Gi0/0
  • R1 Gi0/1 to R2 Gi0/0
  • R2 Gi0/1 to R3 Gi0/0
  • R1 Gi0/2 to R3 Gi0/2
  • R3 Gi0/1 to RCV Gi0/0
Nodes in Multicast: PIM sparse mode, IGMP, RPF and SSM, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
SRCCisco IOSvvios-adventerprisek9-m.spa.159-3.m91 vCPU, 512 MB
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
RCVCisco 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 ENCOR 350-401 guided labs.

  3. Open 22 - Multicast - PIM sparse mode IGMP RPF and SSM 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.