Multicast and Cisco Viptela SDWAN Solution

Today we are going to discuss about the Multicast support in Cisco Viptela SDWAN solution. Let's talk a little on Multicast. A multicast address is designed to enable the delivery of datagrams to a set of hosts that have been configured as members of a multicast group in various scattered subnetworks.

A multicast datagram is delivered to destination group members with the same “best-effort” reliability as a standard unicast IP datagram. This means that a multicast datagram is not guaranteed to reach all members of the group, or arrive in the same order relative to the transmission of other packets.

Multicast in Cisco Viptela SDWAN solution
Viptela software supports native multicast. A vEdge router seems as a native PIM router and establishes PIM neighbor-ship with other PIM routers at a local site. To appropriately extend multicast trees into the overlay network, a vEdge router may need other supporting routers in a local site.

 If a PIM-SM RP is required at a site, that function must be provided by a non-Viptela router, because the vEdge router presently has no native support for the rendezvous point functionality. Receivers residing downstream of a vEdge router can join multicast streams by swapping IGMP membership reports directly with the device, and no other routers are required. This relates only to sites that have no necessity for supporting local sources or PIM SM rendezvous points.

Fig 1.1- Cisco Viptela SDWAN -Multicast

Below are the points on Cisco Viptela SDWAN solution when talking about Multicasting.

  • Cisco Viptela SDWAN vEdges or cEdges interoperate with IGMP v1/v2 and PIM on the service side.
  • Cisco Viptela SDWAN vEdges or cEdges advertise receiver multicast groups using OMP.
  • Cisco Viptela SDWAN vEdges or cEdge Replicators replicate multicast stream to receivers.
  • In Cisco Viptela SDWAN solution multicast is encapsulated in point-to-point tunnels.