ACI L3 Multicast Configuration [Step By Step]

Step-1: Enable Multicast under the VRF

Navigate to Tenant > Networking > VRF > Expand the VRF and select Multicast, then you will see a button “Yes, enable Multicast”:


Step-2: Configure the RP

In our example, we will use an External RP, Under Configuration > Rendezvous Points tab, add a static RP IP and specify the Route-map for it:

When adding RP IP, create a route-map where you can specify the Source and Multicast group range and its corresponding Rendezvous Point, 0.0.0.0/0 can serve as any source:


Step-3: Enable PIM under the L3OUT


Step-4: Make sure Loopback is Enabled under the multicast BLs

  • L3Outs on border leaf should be configured with loopback addresses enabled in the Node profile.  A loopback is required for multicast routing on the border leaf.

“Each multicast-enabled VRF requires one or more border leaf switches configured with a loopback interface. You must configure a unique IPv4 loopback address on all nodes in a PIM-enabled L3Out. The Router-ID loopback or another unique loopback address can be used.”


Step-5: Enable PIM under The Bridge Domains

  • Enable PIM under The Bridge Domains where you have sources or receivers:


Finally, You can verify these basic configuration from the VRF section:

Bilel Ameur

Enthusiastic Network Engineer specializing in Cisco ACI, passionate about solving challenges. A lifelong learner who loves gaining and sharing knowledge. Profile: https://www.linkedin.com/in/bilel-ameur-71116b2b5
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