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In PICOS EVPN multihoming, there are two ways to forward BUM messages: . You can choose one of these to apply to your EVPN fabric.
- Head End Replication. This is the default way which needs no PIM configurations. The BUM message will be encapsulated and sent to all outgoing ports VTEPs of the same VNI by the access VTEP.
- BUM tunnel. All VTEPs of the same VNI join the same multicast group, and use multicast routing protocol PIM to establish a multicast forwarding table entry for the multicast group. This method can reduce the traffic flooding caused by the head end replication of the BUM messages. This way needs to configure PIM protocol.
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