In an ideal multicast solution, the multicast packet is sent only once from a leaf into the spine layer of the network and reduce the replication of flood or multicast packets.
Since the number of spine nodes is less than the number of leaf nodes in a network, the packet replication can be avoided by not sending the same packet multiple times over the same link.
An MDT can be established using BGP and PIM. BGP discovers the VTEPs and PIM establishes the maintains the tree.
There are different types of MDT traffic:
The IP multicast fabric allows user-configured mapping between VNIs and MDTs which supports a default MDT for VLANs or VRFs and VNI specific MDTs, as required. The multicast vxLan tunnels are used to deliver packets. The format of the IP packet is same as a vxLAN packet:
The replication of BUM packet must be controlled and reduced. If there are N VTEPs (neighbors) participating in a VLAN, ingress replication sends N copies of the BUM packet.